National. You don't make it to the pop Top 10 in Billboard magazine by being a regional hit. There's a site called ARSA which lists nothing but radio station playlists over the years. Nowadays, you have to register and log in to cross-reference these lists (ugh!), but it used to be you could type in the name of a song and see how well it did. I've never cross-checked "Oh Happy Day," but I've seen it on enough 1969 playlists while looking for something else. Chicago. Like I said earlier, the Top 40 was far more diverse back then. Remember, Henry Mancini raced to #1 that same year with an MOR piano instrumental. I'm quite sure that no PD banned him for not sounding like the Archies. SSgt. Barry Sadler had a freak hit in '66 with "Ballad Of The Green Berets." Even though he sounded nothing like ? & the Mysterians, it didn't stop him from shooting straight to the top.