diff --git a/index.html b/index.html
index eeaaba6..2627e19 100644
--- a/index.html
+++ b/index.html
@@ -1733,7 +1733,162 @@ const FOLK_PIECES=(function(){
 })();
 
 // Synth genre lookup — all genres that use bg+melody synth mode
-var SYNTH_GENRES={"Classical":CLASSICAL_PIECES,"Video Games":VIDEOGAME_PIECES,"Chiptune Originals":CHIPTUNE_PIECES,"Folk":FOLK_PIECES};
+// ── CHRISTMAS (public domain carols) ──
+const CHRISTMAS_PIECES=(function(){
+  var C3=NT.C3,D3=NT.D3,E3=NT.E3,F3=NT.F3,G3=NT.G3,A3=NT.A3,B3=NT.B3,
+    C4=NT.C4,D4=NT.D4,Eb4=NT.Eb4,E4=NT.E4,F4=NT.F4,G4=NT.G4,A4=NT.A4,Bb4=NT.Bb4,B4=NT.B4,
+    C5=NT.C5,D5=NT.D5,E5=NT.E5,F5=NT.F5,G5=NT.G5;
+  function carol(name,origin,bpm,theme,lanes,durations,passes,root){
+    var bg=[],mel=[],t=0,q=0.25;
+    for(var rep=0;rep<passes;rep++){
+      var v=0.2+rep*0.08;
+      var inst=rep<Math.floor(passes*0.3)?'woodwind':rep<Math.floor(passes*0.7)?'strings':'brass';
+      theme.forEach(function(f,i){
+        var d=(durations?durations[i]:1)*q;
+        bg.push({t:t,f:f,d:d*0.85,i:inst,v:v});
+        if(rep>1)bg.push({t:t,f:f/2,d:d*0.85,i:'bass',v:v*0.35});
+        if(rep>Math.floor(passes*0.5))bg.push({t:t,f:f,d:d*0.85,i:'choir',v:v*0.3});
+        if(rep>Math.floor(passes*0.7))bg.push({t:t,f:f,d:d*0.85,i:'brass',v:v*0.35});
+        mel.push({t:t,l:lanes[i]});t+=d;
+      });
+      t+=0.4;
+    }
+    var r=root||theme[0];
+    [r,r*5/4,r*3/2,r*2].forEach(function(f){bg.push({t:t,f:f,d:2.5,i:'choir',v:0.45});bg.push({t:t,f:f,d:2.5,i:'strings',v:0.4});});
+    bg.push({t:t,f:r/2,d:2.0,i:'timpani',v:0.5});mel.push({t:t,l:4});
+    return {n:name,composer:origin,bpm:bpm,duration:Math.ceil(t+3),isClassical:true,bg:bg,melody:mel};
+  }
+  var jingle=carol("Jingle Bells","J. Pierpont (1857)",140,
+    [E4,E4,E4,E4,E4,E4,E4,G4,C4,D4,E4,F4,F4,F4,F4,F4,E4,E4,E4,E4,D4,D4,E4,D4,G4,E4,E4,E4,E4,E4,E4,E4,G4,C4,D4,E4,F4,F4,F4,F4,F4,E4,E4,G4,G4,F4,D4,C4],
+    [2,2,2,2,2,2,2,3,0,1,2,1,1,1,1,1,2,2,2,2,1,1,2,1,3,2,2,2,2,2,2,2,3,0,1,2,1,1,1,1,1,2,2,3,3,1,1,0],
+    [1,1,2,1,1,2,1,1,1,1,4,1,1,1,1,1,1,1,1,1,1,1,1,1,4,1,1,2,1,1,2,1,1,1,1,4,1,1,1,1,1,1,1,1,1,1,1,4],
+    4,C4);
+  var silent=carol("Silent Night","F. Gruber (1818)",72,
+    [G4,A4,G4,E4,G4,A4,G4,E4,D5,D5,B4,C5,C5,G4,A4,A4,C5,B4,A4,G4,A4,G4,E4,A4,A4,C5,B4,A4,G4,A4,G4,E4,D5,D5,F5,D5,B4,C5,E5,C5,G4,E4,G4,F4,D4,C4],
+    [3,0,3,2,3,0,3,2,0,0,3,0,0,3,0,0,0,3,0,3,0,3,2,0,0,0,3,0,3,0,3,2,0,0,1,0,3,0,2,0,3,2,3,1,1,0],
+    [2,1,2,3,2,1,2,3,2,1,3,2,1,3,2,1,2,1,2,2,1,2,3,2,1,2,1,2,2,1,2,3,2,1,2,1,3,2,2,2,2,1,1,1,1,4],
+    3,C4);
+  var deck=carol("Deck the Halls","Welsh (1862)",130,
+    [C5,B4,A4,G4,F4,G4,A4,F4,G4,A4,Bb4,G4,A4,G4,F4,E4,D4,E4,F4,G4,A4,G4,F4,E4,F4,G4,A4,Bb4,C5,A4,G4,F4],
+    [0,3,0,3,1,3,0,1,3,0,2,3,0,3,1,2,1,2,1,3,0,3,1,2,1,3,0,2,0,0,3,1],
+    [2,1,1,2,1,1,1,2,1,1,1,2,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,2,1,1,4],
+    4,F4);
+  var wish=carol("We Wish You a Merry Christmas","English (1500s)",140,
+    [G4,C5,C5,D5,C5,B4,A4,A4,D5,D5,E5,D5,C5,B4,G4,E5,E5,F5,E5,D5,C5,A4,G4,G4,A4,D5,B4,C5],
+    [3,0,0,1,0,3,0,0,1,1,2,1,0,3,3,2,2,1,2,1,0,0,3,3,0,1,3,0],
+    [1,1,1,1,1,1,2,1,1,1,1,1,1,2,1,1,1,1,1,1,2,1,1,1,1,1,1,4],
+    5,C4);
+  var ocometree=carol("O Christmas Tree","German (1824)",100,
+    [F4,Bb4,Bb4,Bb4,C5,D5,D5,D5,C5,D5,Eb4,C5,A4,Bb4,F4,Bb4,Bb4,Bb4,C5,D5,D5,D5,C5,D5,Eb4,C5,A4,Bb4],
+    [1,2,2,2,0,1,1,1,0,1,2,0,0,2,1,2,2,2,0,1,1,1,0,1,2,0,0,2],
+    [1,2,1,1,1,2,1,1,1,1,1,1,1,3,1,2,1,1,1,2,1,1,1,1,1,1,1,4],
+    4,Bb4);
+  var firstnoel=carol("The First Noel","English (1823)",95,
+    [E4,D4,C4,D4,E4,F4,G4,A4,B4,C5,B4,A4,G4,A4,B4,C5,B4,A4,G4,A4,B4,C5,G4,F4,E4,D4,C4,D4,C4],
+    [2,1,0,1,2,1,3,0,3,0,3,0,3,0,3,0,3,0,3,0,3,0,3,1,2,1,0,1,0],
+    [1,1,2,1,1,1,2,1,1,2,1,1,1,1,1,2,1,1,1,1,1,2,1,1,1,1,2,1,4],
+    4,C4);
+  var joy=carol("Joy to the World","G.F. Handel (1719)",120,
+    [C5,B4,A4,G4,F4,E4,D4,C4,G4,A4,A4,B4,B4,C5,C5,C5,B4,A4,G4,G4,F4,E4,C5,C5,B4,A4,G4,G4,F4,E4,D4,C4],
+    [0,3,0,3,1,2,1,0,3,0,0,3,3,0,0,0,3,0,3,3,1,2,0,0,3,0,3,3,1,2,1,0],
+    [2,1,1,2,1,1,1,3,2,1,2,1,2,1,2,1,1,1,2,1,1,3,2,1,1,1,2,1,1,1,1,4],
+    4,C4);
+  var away=carol("Away in a Manger","J.Murray (1885)",80,
+    [C4,F4,F4,F4,G4,A4,F4,F4,A4,G4,F4,G4,F4,D4,C4,C4,F4,F4,F4,G4,A4,F4,F4,A4,G4,F4,G4,F4,D4,C4,Bb4,A4,F4],
+    [0,1,1,1,3,0,1,1,0,3,1,3,1,1,0,0,1,1,1,3,0,1,1,0,3,1,3,1,1,0,2,0,1],
+    [1,2,1,1,1,2,1,1,2,1,1,1,2,1,3,1,2,1,1,1,2,1,1,2,1,1,1,2,1,2,1,1,4],
+    4,F4);
+  var twelve=carol("12 Days of Christmas","English (1780)",110,
+    [C4,F4,F4,F4,F4,E4,F4,G4,A4,Bb4,A4,G4,F4,G4,A4,Bb4,A4,G4,F4,G4,A4,Bb4,C5,A4,Bb4,G4,A4,F4],
+    [0,1,1,1,1,2,1,3,0,2,0,3,1,3,0,2,0,3,1,3,0,2,0,0,2,3,0,1],
+    [1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,4],
+    5,F4);
+  var hark=carol("Hark the Herald Angels Sing","Mendelssohn (1840)",115,
+    [C4,F4,F4,E4,F4,A4,A4,G4,C5,A4,A4,G4,C5,A4,A4,G4,A4,Bb4,G4,A4,Bb4,C5,A4,F4,G4,Bb4,A4,G4,F4],
+    [0,1,1,2,1,0,0,3,0,0,0,3,0,0,0,3,0,2,3,0,2,0,0,1,3,2,0,3,1],
+    [1,2,1,1,2,1,1,2,1,1,1,2,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,4],
+    4,F4);
+  return [jingle,silent,deck,wish,ocometree,firstnoel,joy,away,twelve,hark];
+})();
+
+// ── SINGALONG (campfire, sea shanties, pub songs) ──
+const SINGALONG_PIECES=(function(){
+  var C3=NT.C3,D3=NT.D3,E3=NT.E3,F3=NT.F3,G3=NT.G3,Ab3=NT.Ab3,A3=NT.A3,B3=NT.B3,
+    C4=NT.C4,D4=NT.D4,E4=NT.E4,F4=NT.F4,G4=NT.G4,A4=NT.A4,Bb4=NT.Bb4,B4=NT.B4,
+    C5=NT.C5,D5=NT.D5,E5=NT.E5,F5=NT.F5,G5=NT.G5;
+  function pub(name,origin,bpm,theme,lanes,durations,passes,root){
+    var bg=[],mel=[],t=0,q=0.25;
+    for(var rep=0;rep<passes;rep++){
+      var v=0.22+rep*0.07;
+      var inst=rep<Math.floor(passes*0.4)?'woodwind':rep<Math.floor(passes*0.7)?'strings':'brass';
+      theme.forEach(function(f,i){
+        var d=(durations?durations[i]:1)*q;
+        bg.push({t:t,f:f,d:d*0.85,i:inst,v:v});
+        if(rep>1)bg.push({t:t,f:f/2,d:d*0.85,i:'bass',v:v*0.35});
+        if(rep>Math.floor(passes*0.6))bg.push({t:t,f:f,d:d*0.85,i:'brass',v:v*0.4});
+        mel.push({t:t,l:lanes[i]});t+=d;
+      });
+      t+=0.4;
+    }
+    var r=root||theme[0];
+    [r,r*5/4,r*3/2,r*2].forEach(function(f){bg.push({t:t,f:f,d:2.0,i:'brass',v:0.5});bg.push({t:t,f:f,d:2.0,i:'strings',v:0.4});});
+    bg.push({t:t,f:r/2,d:1.5,i:'timpani',v:0.55});mel.push({t:t,l:4});
+    return {n:name,composer:origin,bpm:bpm,duration:Math.ceil(t+2.5),isClassical:true,bg:bg,melody:mel};
+  }
+  var drunken=pub("Drunken Sailor","Sea Shanty (Trad.)",140,
+    [D4,D4,D4,D4,E4,F4,D4,D4,D4,D4,E4,D4,C4,D4,D4,D4,E4,F4,D4,D4,F4,E4,C4,A3,D4,D4,D4,D4,F4,A4,A4,G4,F4,E4,D4,C4,D4],
+    [0,0,0,0,2,1,0,0,0,0,2,0,1,0,0,0,2,1,0,0,1,2,1,0,0,0,0,0,1,0,0,3,1,2,0,1,0],
+    [1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,1,1,1,3],
+    4,D4);
+  var molly=pub("Molly Malone","Irish (1880s)",100,
+    [C4,E4,E4,E4,F4,G4,G4,G4,A4,G4,F4,E4,D4,E4,F4,G4,A4,C5,C5,B4,A4,G4,F4,E4,D4,C4,E4,G4,C5,C5,B4,A4,G4,F4,E4,D4,C4],
+    [0,2,2,2,1,3,3,3,0,3,1,2,1,2,1,3,0,0,0,3,0,3,1,2,1,0,2,3,0,0,3,0,3,1,2,1,0],
+    [1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,2,1,2,1,1,1,1,1,1,1,2,1,1,2,1,1,1,1,1,1,1,4],
+    4,C4);
+  var whiskey=pub("Whiskey in the Jar","Irish (Trad.)",125,
+    [G4,G4,A4,B4,B4,A4,G4,E4,D4,E4,G4,G4,A4,B4,D5,B4,A4,G4,E4,D4,E4,G4,A4,B4,A4,G4,E4,D4,E4,G4],
+    [3,3,0,3,3,0,3,2,1,2,3,3,0,3,1,3,0,3,2,1,2,3,0,3,0,3,2,1,2,3],
+    [1,1,1,2,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,1,1,1,1,2,1,1,1,1,1,3],
+    5,G4);
+  var parting=pub("The Parting Glass","Irish/Scots (Trad.)",80,
+    [E4,G4,A4,B4,A4,G4,E4,D4,E4,G4,A4,B4,D5,B4,A4,G4,E4,G4,A4,B4,A4,G4,E4,D4,E4,G4,A4,B4,D5,B4,A4,G4],
+    [2,3,0,3,0,3,2,1,2,3,0,3,1,3,0,3,2,3,0,3,0,3,2,1,2,3,0,3,1,3,0,3],
+    [1,1,2,1,1,1,2,1,1,1,2,1,1,1,2,2,1,1,2,1,1,1,2,1,1,1,2,1,1,1,2,3],
+    4,E4);
+  var amazing=pub("Amazing Grace","J. Newton (1779)",80,
+    [G4,C5,E5,C5,E5,D5,C5,A4,G4,G4,C5,E5,C5,E5,D5,G5,E5,E5,C5,E5,D5,C5,A4,G4,G4,C5,E5,C5,E5,D5,C5],
+    [3,0,2,0,2,1,0,0,3,3,0,2,0,2,1,0,2,2,0,2,1,0,0,3,3,0,2,0,2,1,0],
+    [1,2,1,1,1,2,1,2,2,1,2,1,1,1,2,2,1,1,1,1,2,1,2,2,1,2,1,1,1,2,4],
+    4,C4);
+  var auld=pub("Auld Lang Syne","R. Burns (1788)",95,
+    [C4,F4,F4,F4,A4,G4,F4,G4,A4,G4,F4,F4,A4,C5,D5,D5,C5,A4,A4,F4,G4,F4,G4,A4,G4,F4,D4,D4,C4,F4],
+    [0,1,1,1,0,3,1,3,0,3,1,1,0,0,1,1,0,0,0,1,3,1,3,0,3,1,1,1,0,1],
+    [1,2,1,1,2,1,1,1,2,1,1,1,1,1,3,2,1,2,1,1,1,1,1,2,1,1,2,1,2,4],
+    4,F4);
+  var saints=pub("When the Saints Go Marching In","Spiritual (Trad.)",120,
+    [C4,E4,F4,G4,C4,E4,F4,G4,C4,E4,F4,G4,E4,C4,E4,D4,E4,E4,D4,C4,C4,E4,G4,G4,F4,F4,E4,F4,G4,E4,C4,D4,C4],
+    [0,2,1,3,0,2,1,3,0,2,1,3,2,0,2,1,2,2,1,0,0,2,3,3,1,1,2,1,3,2,0,1,0],
+    [1,1,1,3,1,1,1,3,1,1,1,2,1,1,1,2,1,1,1,2,1,1,2,1,1,1,1,1,2,1,1,1,4],
+    4,C4);
+  var clementine=pub("Oh My Darling, Clementine","P. Montrose (1884)",110,
+    [C4,C4,C4,G3,E4,E4,E4,C4,C4,E4,G4,G4,F4,E4,F4,G4,G4,F4,E4,F4,E4,D4,C4,D4,E4,F4,F4,E4,D4,E4,C4],
+    [0,0,0,3,2,2,2,0,0,2,3,3,1,2,1,3,3,1,2,1,2,1,0,1,2,1,1,2,1,2,0],
+    [1,1,1,2,1,1,1,2,1,1,2,1,1,1,2,1,1,1,1,1,1,2,1,1,2,1,1,1,1,1,4],
+    4,C4);
+  var scarborough=pub("Scarborough Fair","English (Medieval)",85,
+    [D4,D4,D4,A4,A4,E4,F4,E4,D4,A4,G4,A4,C5,B4,A4,B4,A4,G4,E4,D4,D4,A3,D4,E4,F4,E4,D4],
+    [0,0,0,0,0,2,1,2,0,0,3,0,0,3,0,3,0,3,2,0,0,4,0,2,1,2,0],
+    [2,1,2,2,1,1,1,2,2,1,1,1,2,1,2,1,2,1,1,2,1,2,1,1,1,2,4],
+    4,D4);
+  var bonnie=pub("My Bonnie Lies Over the Ocean","Scottish (1881)",120,
+    [G4,F4,E4,F4,G4,A4,G4,F4,E4,C4,D4,E4,F4,G4,F4,E4,F4,G4,A4,G4,F4,E4,D4,C4,E4,G4,E4,C4],
+    [3,1,2,1,3,0,3,1,2,0,1,2,1,3,1,2,1,3,0,3,1,2,1,0,2,3,2,0],
+    [1,1,1,1,1,2,1,1,1,2,1,1,2,1,1,1,1,1,2,1,1,1,1,2,1,2,1,4],
+    5,C4);
+  return [drunken,molly,whiskey,parting,amazing,auld,saints,clementine,scarborough,bonnie];
+})();
+
+var SYNTH_GENRES={"Classical":CLASSICAL_PIECES,"Video Games":VIDEOGAME_PIECES,"Chiptune Originals":CHIPTUNE_PIECES,"Folk":FOLK_PIECES,"Christmas":CHRISTMAS_PIECES,"Singalong":SINGALONG_PIECES};
 
 function buildClassicalNotes(piece){
   var raw=piece.melody.filter(function(m){return activePads[m.l];})
@@ -1821,7 +1976,7 @@ function buildMenu(){
     gt.appendChild(b);
   });
   // Synth genre tabs (Classical, Video Games, Chiptune Originals, Folk)
-  var synthIcons={"Classical":"\uD83C\uDFBB","Video Games":"\uD83C\uDFAE","Chiptune Originals":"\uD83D\uDC7E","Folk":"\uD83C\uDFB6"};
+  var synthIcons={"Classical":"\uD83C\uDFBB","Video Games":"\uD83C\uDFAE","Chiptune Originals":"\uD83D\uDC7E","Folk":"\uD83C\uDFB6","Christmas":"\uD83C\uDF84","Singalong":"\uD83C\uDFB5"};
   Object.keys(SYNTH_GENRES).forEach(function(sg){
     var cb=document.createElement("button");
     cb.className="gtab"+(curGenre===sg?" active":"");