"Everyday People" was released late in 1968, months ahead of the Stand!
album. In America, it hit #1 in February 1969 and stayed there for four weeks.
In September 1969, the cartoon Scooby-Doo, Where Are You!
made it's debut, possibly borrowing from the line in this song:And so on and so on and scooby dooby doo
Let's see if we can get to the bottom of this mystery.
The song certainly brought the phrase "scooby doo" to the forefront, but three years earlier, Frank Sinatra did some scat singing, ad-libbing "doo-be-doobie-do" on "Strangers in the Night
." That's where the animated dog got his name.
Variations on "scooby doo" or "doobie doo" had been around for a while, both as nonsense syllables and as expressions of surprise.