[Actually, Henri DeBusscher studied with Guillaume Guidé at the Brussels Conservatoire. See below from Grove Music Online:]
(b Brussels, 29 Oct 1880; d Los Angeles, 25 Aug 1975). Belgian oboist. He was the second, and most distinguished, of three brothers who began their musical lives as boy sopranos (the De Busscher Trio). All three studied the oboe under Guillaume Guidé at the Brussels Conservatory.