Musicians also object to a proposed contract clause allowing management to hire non-union or volunteer musicians, although a representative of the American Federation of Musicians told the Post-Gazette that the current contract already allows for alternative musicians.

Union representatives last met with management on May 11, according to the paper. At that meeting, musicians asked for financial information; they have not yet gotten a response. The current contract expires tomorrow.

A spokesperson for PBT management declined to comment, saying "We're not going to negotiate the contract in the media."