There's one Mercury LP,'Quincy Jones Explores the Music of Henry Mancini', where the liners extoll the sole arranging skills of Q. A keen look at the front cover will reveal, on the sheet music for 'Moon River' perched on a piano top, "Arr. Bill Byers" in small print under the large point upper-cased, "QUINCY JONES ORCH." (I'll bet a proofer from Mercury's art department was summoned to Q's office.)
According to AMG, Byers was indentured to Quincy's right hand for five years at Mercury. No doubt it meant food on the Byers' family table and shoes for the kids. With Q in the position to 'make the call', Byers was eventually rewarded with his own album, 'Impressions of Duke Ellington', a swinging big band LP for the Mercury Perfect Presence Sound series.