Minecraft wiki entry for Redstone_music, associated text: 1 Basics
1.1 Tips
1.2 Redstone
2 Translating real music
2.1 Pitch
2.2 Rhythm
2.3 Sounds
3 Songs and sounds
3.1 "Choo Choo" Train
3.2 Twinkle Twinkle Little Star
3.3 The Star Spangled Banner
4 External software
4.1 Note Block Studio
5 See also