Lead singer who was very good and very well known started pushing his karaoke act during our full band shows. I saw it in direct competition to the band working. He got to the point where he actually started singing along with his ipod during our breaks, handing out flyers and promoting over the mic while on stage with the band. I had worked with the band for 6 years but told them that this was the last straw and if he continued to do it I would be done with the band. I had already given my notice months ago and was willing to stay on until they found a replacement. It seemed like they were making no real effort to find replacement. When the singer started with the ipod I said if he does it again it would be my last gig. They thought I was joking. With about 10 minutes left in a gig someone in the audience requested a song the band didn't do. He pulled out his ipod and started singing along while the band stood there. I unplugged my bass, loaded amp into my car and that was it. I heard they were really pissed but I had given them clear warning I would be done next time it happened.