Ummm...could the connection be that their initials are both "PG"??

[/QUOTE]
Who knows?
I got this from a Canadian music site, an interview with Peter Gabriel:
Another great guitarist enticed into playing on Sky Blue was British bluesman Peter Green, the founder of Fleetwood Mac in the late '60s, before he pursued a solo career in the '70s, and subsequently fell off the radar.
"I used to go watch John Mayall as a teenager and he had these great guitarists with him -- Clapton, Peter Green, Danny Kirwan, Mick Taylor -- but Peter Green, I think, was probably my favourite," Gabriel said. "He was the most soulful and understated. And then he went on to do this great sort of writing with early Fleetwood Mac. And it was quite adventurous. So then, when he was written off as a drug casualty, I was delighted to see him coming back and starting again. I always like when people who have been discarded and discounted find their way back."
Peter's parts were recorded during the Time Traders sessions. Maybe there will be more on Gabriel's new album, as much of it is from the sessions for
"Up".