The whole army of young musicians starting to come to the Guildhall. . just created a space and said, 'Brothers, come on! We need you in here!' So Monday morning you’d go to the Guildhall and you’d stand in the foyer – blacker than black! I don’t think the Guildhall has ever been so ‘blacked’ out before or since. We’re talking mid-eighties... Everyone came to the Guildhall, because we were all there, it was like a meeting place." Grigson invited other musicians to coach on his course, including American saxophonist Jean Toussaint in 1987. Grigson was the author of a number of publications, including "A Jazz Chord Book" (first published in 1981, and since twice reprinted), "Practical Jazz" (1988), "Jazz from Scratch" (1991), as well as studies of the music of Charlie Parker, Louis Armstrong and Thelonious Monk. Grigson's "A Thelonious s Monk: Study Album" is listed among 224 books in the library of David Byrne.