Garbarek's sound is one of the hallmarks of the ECM Records label, which has released virtually all of his recordings. His style incorporates a sharp-edged tone, long, keening, sustained notes, and generous use of silence. He began his recording career in the late 1960s, notably featuring on recordings by the American jazz composer George Russell (such as Othello Ballet Suite and Electronic Sonata for Souls Loved by Nature). If he had initially appeared as a devotee of Albert Ayler and Peter Brötzmann, by 1973 he had turned his back on the harsh dissonances of avant-garde jazz, retaining only his tone from his previous approach.