You do not need the other owner's permission to perform the song live if the venue has a license that covers the song from a performing rights society, such as ASCAP or BMI. However, the question about sharing contest winnings is more difficult. Joint owners of a copyright work must "account" to the other owners for profits derived from exploiting the work. The law governing the right to an "accounting" falls under state law. You would have to consult an attorney familiar with "accounting" in the state law in which you live or would be performing the song to answer that question.
Answered on Jul 02nd, 2012 at 4:01 PM