Vic Smith,

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.

I think the article is actually suggesting that ECM records (not Quercus) introduced the world to Keith Jarrett and Pat Metheny. And that would be true. Both of them have recorded extensively for ECM since the 1970's and '80's. At that time, no other label was releasing anything like the music that both Jarrett and Metheny were making.