While I vastly prefer using live music, I call my share of dances with recorded music, and
have for decades.
Some people have cited some good recordings. Listen to recordings that are *almost*
suitable, but can be made suitable by lengthening, shortening, excision of an
"interesting but undancible" round, etc. Use audio editing software such as
Audacity (free) to make things the way you want. As a result, I have a collection of cuts
from 5x to 7x (lots of those), 8x, 9x, 11x and 15x.
I keep my music organized on my laptop and accessed by the MIT Folk Dance Club player.
See
http://home.comcast.net/~a1penguin/ for details on that. It is mostly bug-free, but it
is free.
You don't need tons of material right away. Build it up as you go along.
Dan