I think playing for a private party is different than playing for a 'corporate' function or a 'public' gig, i.e piano lounge, restaurant, etc. ... what also must be taken into consideration is the audience. Example: I played a 'piano lounge' where the bar clientele was the same crowd, Friday and Saturday every week ... during the evening I would only allow people I knew to get up and sing, and I would introduce them as a 'personal friend and fellow entertainer' ... any others, I would explain that since I did not know them, I did not feel I could do justice in backing them up ... BUT, near the end of the night some of the bar regulars would come around the piano bar and start singing ... the owner loved it, the remaining audience loved it, and the tips were good ... so I figured "knock yourselves out"
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Playing a private party, everyone knows each other, and more often than not also know who is going to get up and sing, whether they are making a fool of themselves, or performing well ... In this case, I don't think a poor performance is a reflection on the paid entertainer, but on the 'sit-in' ... especially if the paid entertainer is otherwise doing a good job ...
If the host requests in advance that someone sing, I try to get the song they will sing in advance of the function ... if necessary I would work out the key during a break - LOVE that 'transpose' button
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I would not allow 'sit-ins' at a corporate party if I did not know them because there the reflection of a poor performance usually falls back on the entertainer ...
PS: chas - love your response
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t.
[This message has been edited by tony mads usa (edited 11-29-2006).]