Overall sound quality is more important to the performer than the audience. Zuki hit the nail on the head, and that doesn't just apply to nursing homes. The same rules apply to all gigs/jobs (sorry Uncle Dave). DonM is right on as well--you have to play the song(s) they know.
------------------ Travlin' Easy
PSR-S950, Bose L1 Compact, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!