New ways to cover missing parts other than backing tracks

After reading the numerous threads on people hating (or not) backing tracks for cover bands, I figured this would be an interesting thread. I've played with a band that does some blues/rock/country covers - guitar/bass/drums and a vocalist who plays flute and sax. We have used the flute to cover a lot of signature organ and keyboard lines - sometimes with effects to emulate a Leslie. It's worked very well for
Whipping Post, Love Her Madly, What I Like About You (sax on keyboard solo), Roadhouse Blues, as well as some others. People know it's not the same, but it sounds great, and allows for some great instrumental breakouts - trading solo licks and such.

Anyone else?