''A longtime rock fan, Thompson got the gig of a lifetime in 1985 when he was asked to sit in with the remaining members of Led Zeppelin when they played at the Live Aid benefit concert at Philadelphia's JFK Stadium. Thompson then joined the Zeppelin trio for some secret recording sessions in 1986. Rumors of a reunion were quashed, however, when Thompson was involved in a serious car accident later that year.''


from
http://www.hollywood-underground.com/archive7.htm
:)