I say, "Sorry, don't know that one." when the band doesn't know it. As a member of the band or the audience I'd rather that a band skip a song they don't know than butcher it. I think that bands don't do nearly as good a job playing something that most of the band doesn't know as they think they do.
Or sometimes you say it when you just don't want to play it...
One band I was in, the singer and I were chatting with a lady between sets, and asking if she had any requests. She said (surprise surprise), "How about Mustang Sally?" The singer looked at her blankly and said, "Sorry, we don't know that one." Well, it was true we had never played it together in that particular group - but all of us had experience in other groups and I'm sure all must have played it before, we easily could have pulled it off. I had even sung it in a demo track for another band. I'm sure she just didn't want to.
I told him my plans to learn a bunch of covers, and that I played through Mustang Sally and Brown Eyed Girl yesterday. He was excited that I knew them, so we worked on them a bit. I think it's hysterical that we're excited to learn these, since they tend to be every cover band's recurring nightmare LOL
Honestly, I don't see the big deal with it. It's a popular tune, it gets played too much... whatever. I like entertaining people. I like people up and dancing and having a good time. If Sally gets them up, no problem. I hated Summer of 69 the minute I heard it, never liked that song. Last summer I was on a party gig, and we started it, and the crowd got up and danced and sang along, and it struck me - I'm ENJOYING this. Even Summer of 69.
Can people learn that soul/gospel scream? Or are people just born to do it? LOL I so wish I could sing like that.
You mean the blues "shouter" voice. It does take technique to do it correctly. Most people just shout, and wind up straining their vocal cords - in fact you can do permanent damage if you do it too much. The aforementioned singer (who refused to sing Mustang Sally) has a permanent rasp in her voice because she damaged her vocal cords singing blues wrong when she was younger. She's still a great singer but she can't do a "sweet" clean voice. She explained that the right way to do it entails actually loosening up your throat more than usual to let it vibrate, whereas most people tense up and constrict to do it, which is what does the harm.
This is her now (bassist isn't me, it's their previous guy):