Wow- lots of interesting posts, but not many filkers reading this list! Filk (mentioned in an earlier post by Jeri) is the SF folk music genre- lots of Trek stuff and much much more. Try searching on "filk" or reading rec.music.filk (they just posted a FAQ), check out The Virtual Filksing: http://www.prometheus-music.com/eli/virtual.html. A fairly well known filker named Roberta Rogow has an album in production titled "Still Trekking After All These Years". If you are an SF fan and music-lover and have not checked out filk, it is a lot of fun- R.