Inner voice? That would be the songs? Are these songs you make up, or something you've heard? Vocals? Instrumentals? Same one, over and over -or a selection? Are the songs the innver voice, or is there ALSO an inner voice speaking to you or from you?
I'm not sure why this is, but I hear music -as in orchestra or instrumental music- kind of embedded in other sounds around me, be they natural or human produced; sometimes I make up a complete tune out of it.