i think Sparteye was referring to songs which can change lyrics,not different songs with the same tune

Yes, dear, I know ... but MaxQ asked and as he has been so kind as to answer many of my questions, I thought it only fair ... or is that yet another tangent?

Oh, by the way, didn't Huey Newton win a law suit because someone stole the melody for "I want a new drug" (title?) then speed it up a bit and use it as background for a movie?