From the MCRFB NEWS archive: 1964 The Bill Gavin Newsletter   By BILL GAVIN Billboard Contributing Editor “TOP 40 RADIO,” as we have known it for a decade, is fast becoming obsolete. “Top 40,” as a term of reference relating to a music format based on singles sales, will undoubtedly continue in our vocabulary for … Continue reading GAVIN REPORT: TOP 40 RADIO GETTING DEEP SIX . . . . SEPTEMBER 12, 1964