Song With Best Beginning

Back in '72/'73 there were three albums that came out with a heart beat as the first song/intro.
Tull's "Passion Play"
ELP's "Trilogy"
Floyds, "Dark Side of the Moon"
I quite often wondered how they all came about to be released around the same time with the same intro. I figured the producers were out slamming ales somewhwere in Great Briton and got to talking about music production. I could hear them in the morning, " Ive gah' a brilliant eye-deeya. We'll star' wih' an arhbeyt."
-John

I also have to say the Intro to "Sweet Jane" on Lou Reed's Rock and Roll Animal LP.

"Kick Out The Jams," MC5
"And Your Bird Can Sing," The Beatles
"Chest Fever," The Band
"Green Onions," Booker T. And The M.G.s

Get real fools, even an old Classical Music fan like me knows Marvin and Tammy's " Ain't nothing lke the real thing baby" tops all comers.

Talking Heads - Once In A Lifetime.