Stolen Song

I'm somewhere, indoors, with MI, and possibly on TV or radio, there's the end of a program (or an ad), and the music in it is a variation on an actual song of mine ("O.D.W.C.") I'm amazed as I hear it and start wondering how it could have been stolen like that and by whom. It's just the chorus but enough of it to be a clear infringement. Vocals are wordless but melody is distinct.