Sheet music
From HymnWiki
Creating Sheet Music
Anyone can create sheet music for free and post it up on this site (provided the sheet music is hymn-related). How? one might ask. Try LilyPond: LilyPond website. It's free software for typesetting music. Now, you can always buy something for hundreds of dollars to do it (like Finale or Sibelius), and those have graphical interfaces. LilyPond works much like a computer programming compiler (i.e. you type out your sheet music in text and compile it with LilyPond; then, you get your sheet music files as a result: pdf, midi, ps, dvi, tex, etc.)