McDonald's was serving breakfast back to the mid 60s - maybe just not the New York area franchisee.
Then again, Manhattan was the last place in the country get McDonald's at all and that was around 1976. About the same time Horn and Hardart was turning Automats into Burger Kings.
WABC played contemporary music until 1981. WNBC had music for a few years after that but by the mid 80s, Imus and Howard didn't play many records and a midday all-request show was dropped for Soupy Sales.