If you don't have any filk music, you're missing a lot. Filkers are mostly amateur musicians, both in the sense of being non-professional and of loving what they do, and plenty good space-related music has come from that area.

I tried to dig up a web site for Bill and Gretchen Roper's Dodeka Records but I can't find it. They sell a huge variety of filk CDs and tapes at SF cons.

Fred

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"For shame, gentlemen, pack your evidence a little better against another time."
-- John Dryden, "The Vindication of The Duke of Guise" 1684