Btw, Nicely done at triggering those almost forgotten memories of that song. The second I figured out what the tune sounded like, something clicked and, sure enough, my suspicions were correct. XD Oh childhood, how I miss you.
In the origional 80's MLP, there was a species of pony called "Sea Ponies". These ponies looked like giant seahorses, and were introduced in "Rescue from Midnight Castle". They sang the song "call upon the Sea Ponies" (can be found on youtube by following: [link]) and the lines "SHOO BE DOO SHOOP SHOO BE DOO!SHOO BE DOO SHOOP SHOO BE DOO!" were prominent.