Minecraft wiki entry for Development_versions, associated text: Added 11 new note block sounds:
Bone block = Xylophone
Block of gold = Bell
Clay = Flute
Packed ice = Chime
Wool = Guitar
Block of iron = Iron Xylophone
Soul sand = Cow Bell
Pumpkin = Didgeridoo
Block of emerald = Bit
Hay bale = Banjo
Glowstone = Pling