I've been playing for a long time so I've experienced the flop many times. Someone used the word "sobering" in another post and that's the perfect word for it. It happens less with acoustic shows because of the dance-floor factor in bands but it does happen. Tried playing "Run To You" by Bryan Adams the other evening at a solo gig and it didn't get much of a response. No worries, I have about 250 other songs I can play.