I had the privilege of guesting at a simcha recently in one-man-bandville. 'twas an informative experience.
A few high (low?) points.
1) Two women emerge from around the mechitza and approach the "musician" with the following request. "Can you possibly turn down/off the speaker on the women's side. We understand that, for the men, its geshmak like this. By the ladies, its too loud."
The fun part was that the speaker on the women's side was already off. Gives an idea of the volume, though.
2) Carlebach's V'hayu Limshisa as a 4/4 rock song! Arranger technology can make even a one finger player sound way better than he deserves. That said, the musician still does need to be able to tell the difference between counting to three and counting to four.
3) Who said musicians need to present properly/dress up for simchas? Apparently, there's no need to shave, put on a jacket, tie, or even tuck in your shirt.
4) Apparently, disco is the style of choice for "dinner" music. Who knew?
5) All Am/C Major, all the time!