I had one happen to me at The Getaway last year. I sang a song that I often sing, during a song circle. Another of the participants (a good friend of mine) apparently felt like the song was his. He has a powerful voice, and he insisted on singing over the top of me, even though his version and mine have differences. It was so annoying, and really bothered me. I have a distinctive way of doing the song, and felt the effect I was after was ruined by this. He's a good enough friend that I didn't say anything, but I really felt that this was a dramatic lack of courtesy.

Mick