Roger Waters Pros & Cons tour in the 90s in London.
Roy Harper in 1983 in Northern Ireland and many times since.
Martin Stephenson in a pub in Dublin in the 80s
Honorable mentions
Neil Young
Leonard Cohen
10000 Maniacs
Black Heart Procession
Prince
Black Sabbath
Loudon Wainwright lll (many times)
The Pogues
Status Quo
Paul Simon
Bob Marley
Country Joe and the Fish
Tallis Scholars
Gary Newman