I'm recording a talented but unknown singer and a her guitarist friend, who is also quite fine, but not well-known. My little studio is humble, and a good starting place for people on a budget. They've heard me play at jams, and want me to contribute a solo and some backing for their songs on my sax. If I do this as work for hire, am I responsible for paying royalties to the copyright owner of the jazz standards? Thanks for advice.