Question: What is the date of death of the performer of song Sleep Dirt (Instrumental)?
Sentence (from "Sleep Dirt (instrumental)"): Sleep Dirt is an acoustic guitar duet featuring Frank Zappa and James Youman on Zappa's album "Sleep Dirt" that pursues the close-up intimacy of "Zoot Allures" as an insistent peaceful motif with conventional evocation.
Relevant evidence: Yes