Blue Oyster Cult is well-known for having a song with lots of cowbell. April Wine, an oldschool Canadian supergroup, has its own cowbell song, Oooh What A Night. April Wine was huge in Canada. I can't say that April Wine was as big elsewhere, which, like Red Rose Tea's exclusivity, is a pity.
April Wine - Just Between You And Me
April Wine - I Wouldn't Want To Lose Your Love
April Wine - Say Hello
April Wine - Sign Of The Gypsy Queen
April Wine - Tonight Is A Wonderful Time
April Wine - You Won't Dance With Me