[Callers] Calling without a band?

Hi all - Have any of you called for a dance without a band? I've gotten a query about calling a barn dance, but their budget is teeny tiny, so they asked if I could call to CDs. I know this is quite possible; my dad used to call square dances to records, but those records were specifically made for dancing to. Most contra music tracks I have only last at most ~3 minutes. I could theoretically splice the tracks together to make a repeating loop, but this is a lot of time investment and also, how would you know when the music would stop, in order to go out? Would you try to guess, or just unceremoniously turn the thing off, or do the "mood fade?" (And no, sadly, I'm not like Alan Furth or Erik Hoffmann, folks who can call and play guitar/fiddle/banjo//etc. well at the same time.) Do you have any strategic ideas? Thanks! Tina