For many years I've been the keyboard player in After Hours. I also sang harmonies, and played saxophone including blues harp (10 hole harmonica).
This included creating and maintaining many MIDI backtracks, as I was the techie in the band. Over the years, the backing music had to be migrated from keyboard sequencer to hardware sequencer, and finally to computers. This kept me very busy, as we had around 80 songs. We would choose to have 40 available per gig.