Another quotation from towards the end of the article:-

It's part of a three-day celebration of the Munich classical and jazz crossover label ECM, which, along with its support of Quercus, has helped introduce to the world such far-flung avant-gardists as jazz pianist Keith Jarrett, experimental guitarist Pat Metheny......

1] To suggest to a jazz enthusiast, that Quercus - fine a group as they may be - have been able to 'introduce the the world to' a central jazz figure like Keith Jarrett is plain nonsense. Since the early 1970s Keith has enjoyed a great deal of success as a group leader and a solo performer in jazz, jazz fusion, and classical music.

2] To use the French phrase avant-garde to try to create an English word/phrase avant-gardists is poor thinking as well as being inaccurate. Surely the Irish deserve better from an Arts journalist in one of their leading newspapers?