Question: Which English musician from the English rock band Deep Purple apeared on the English television show Gastank?
Sentence (from "Gastank"): Hosted by former Yes keyboardist Rick Wakeman, the show featured a mix of interviews with 1970s musicians and impromptu performances where the guest artist would join Wakeman and his house band in playing re-arranged versions of their classic songs, or entirely new pieces created for the show.
Relevant evidence: No