La Sorbonne was a notorious pub/club throughout the eighties, deep in the belly of the Cowgate. It played host to various gigs as well as being one of the most infamous places in Edinburgh. 

1985 May 13th The Clash

The Clash played here the night before they "busked" at Coasters, announcing the following nights gig to a handfull of amazed patrons!   Joe Strummer was spotted by Hazel,  a friend of your author,  in Princess Street that day, she asked him what they were busking for?  Strummer said "beer money" and promptly offered her a drink from his beer can, he then asked her where La Sorbonne was!

2005  29th May The Arctic Monkeys (When the venue was known as Subway)