Me personally on a solo OMB gig don't mind as long as they get an OK from the person who hired me first & even then I rarely let them do more then one or two songs with me either singing or playing another instrument so not to let them Bogart the stage good or bad, especialy when people are payng good money to enjoy the evening & music, or to put a kabosh on it becoming an open mic night......in my band days same thing, plus the ok from band members also...

How do you feel about it?