I guess to be accurate, WOWO could have been called in today's terms an AC or even a hot AC, as could some of their Westinghouse sister stations, especially WBZ in Boston. My earliest recollections of their music mix (this would have been mid 60's) seems to include a good bit of rock & roll...They shied away from the harder British stuff like the Yardbirds or the Kinks, and the harder edged soul artists like James Brown and Wilson Pickett. There was quite a bit of MOR including Dean Martin and Frank Sinatra, who were still having number one hits at that time, and quite a bit of country, especially during Little Red Barn. (Don't forget the Songs of Inspiration, usually gospel quartets like the Blackwood Brothers.) If there was a center to their music mix, it would have included maybe the Supremes, the Beach Boys, the Four Seasons, Johnny Rivers, and Petula Clark. Actually, their music mix probably wasn't that far from WLS, which was always one of the more conservative top 40 stations around.
ETA: Reelradio.com has just posted its first WOWO aircheck...It's a clip of Bob reassuring listeners concerning an EBS test that was apparently botched at the point of origin, and freaked out a lot of people across the country.