When Van Halen was touring with Gary Sherone, they had this Live in Australia performance that was broadcast on a local music channel. I do remember seeing Michael Anthony tapping, in harmony, with
Eddie Van Halen on some fills during that performance.
There's also a Canadian metal band (I think the genre is called Metalcore), called "Protest the Hero". They have a video for the song "Blindfolds Aside" that has both guitarists and the bassists tapping during the bridge.
Found it on YouTube!:
http://youtube.com/watch?v=HWlQhxSJI...dfolds%20aside