Possible topic: which rock musician would be most disappointed by what he/she has become? Which would freak out the most if a time machine dropped music from the present into 1972? My guess is Eric Clapton -- Layla-era coked out Clapton hearing Tears in Heaven? Things would be smashed.
FOT PScan has a good guess: Rod Stewart.
I await your response in 2015 when your queue for topics opens up, Tom Scharpling.