Legend has it (don’t know if its true) that the band who recorded Na Na Hey Hey was actually recording a slow ballad and they finished with some studio time to kill so they put together Na Na Hey Hey as ad-lib filler to go on the back of the 45. They intentionally recorded it too long (most singles then couldn’t go past 3:30 if they wanted air time) so nobody would confuse it with the A-side.
The label hated the ballad but loved the ad-lib so they added some accompaniment and released the song under the group name “Steam” so as not to harm the branding of the group’s other tunes which were mostly love ballads.
“Steam” became a one-hit wonder and the song has long cemented its standing in rock music lore.
By the way, does anyone besides me think the tune before the ad-lib isn’t taken from Jerry Butler’s “He Will Break Your Heart” which was re-released in the mid-70s by Tony Orlando and Dawn as “He Don’t Love You Like I Love You” which reached #1 on the singles chart?
I was surprised to learn Kiss Him Goodbye was written in the early 60s.