Actor Nat Cassidy and I put most of the music for the recent production of my play JANE EYRE together using sound loops from GarageBand, but I did compose one original piece the "Jane Eyre Waltz" from scratch, which I'm pretty proud of. The most complete piece of music before that which I created was Cinco de Mayo, which, although I wrote the melody line, is mostly loops.
Check out music from JANE EYRE here.