Well,
If you have your own Mechanical License you can issue a license to the second Artist. Songs are covered from time to time. It is allowed in copyright law. I have my own permission letter if an artist wants to record one of my songs and the mechanical license. My permission letter and the mechanical license has a place for all the information required for issuing the license. Number of copies, artists name, contact info, record label, License cost, Approximate release date. If your Publisher did all this stuff you may want to get back with him. Good luck.


Ray E. Strode