What Led Zeppelin guitarist contributed to a tribute album to Rainer Ptacek?
Rainer Ptacek:  A tribute album to Ptacek, "The Inner Flame", included contributions by Plant, Jimmy Page, PJ Harvey, Emmylou Harris and others, and was indicative of his reputation as a "musician's musician". Jimmy Page: James Patrick Page, {'1': ", '2': ", '3': ", '4': "} (born 9 January 1944) is an English musician, songwriter, and record producer who achieved international success as the guitarist and founder of the rock band Led Zeppelin.
Jimmy Page