Im trying to figure out how can I get the keyboard/piano line for my live music when my keyboard player is absent? Durms and guitar/bass are always there. What can I do?
A couple of options:
make charts of the keyboard part and find a substitute player for the gig
record the keyboard parts and have a playback device that you can send into the PA or an amp.
Finding a sub that can play the charts can be difficult, and may require additional rehearsals, or clean charts and a competent player. Their pay may be higher than what the band members normally get also.
Playing to a recording can be an issue in a live show as it is difficult to reset the groove if the band starts to drift. That being said, I know two different bands that use a laptop on stage to play additional parts. The bands rehearse with the parts and their drummers are good so they don't have any issues.