Paul Simon doc reveals ‘white noise’ that inspired ‘The Sound of Silence’

It was the sound of running water — not the sound of silence.

That was the mundane muse behind the angelic ascension of “The Sound of Silence” — the chart-topping classic that had Simon & Garfunkel making all kinds of noise after their 1964 debut.

“I used to go into the bathroom of my parents’ house. There was tile on the wall, and I’d turn the water on,” recalls Paul Simon — who wrote the duo’s first hit — in the two-part documentary “In Restless Dreams: The Music of Paul Simon,” which premieres on MGM+ Sunday and continues on March 24.

“And the tile made the echo, and the water was like a white noise sound. It was going to a space that was a zone.”

For Simon, 82, sitting in the john of his parent’s home in Flushing, Queens, made him flush with creativity.

“There was a very easy flow of creating energy,” he explains. “One second ago, that thought wasn’t here — and now I’m weeping. How’d that happen? And how can I do it again?”

However, on the first demo of “The Sound of Silence” that was recorded in 1964, Art Garfunkel was on mute. “It was just me, it wasn’t with Artie,” says Simon of his solo vocal without his childhood buddy in harmony.

But after playing the song — which was originally titled “The Sounds of Silence” — for Bob Dylan’s Columbia Records producer Tom Wilson, Simon felt as if it was missing something: Garfunkel.

“And I said, ‘I sang this song with a friend of mine. Could we come in and audition for you?’ He said, ‘Yeah, sure.’”

“So Artie and I came in and sang it. And they said they would sign us. We were very excited because really at that time you couldn’t be at a more prestigious place than Columbia Records.”

Still, there was “a big debate” about what the  duo — who had previously released the 1957 hit “Hey Schoolgirl” as Tom & Jerry — would be called.

“Because there was a group called Art and Paul,” explains Simon in the doc. “So now Columbia was trying to figure out names, and God they were awful. They were really awful. I mean, one of them was the Rye Catchers.”

Finally, though, an executive decision was made.

“The president of Columbia Records, Goddard Lieberson, stepped in and said,  ‘No, their name should be Simon & Garfunkel,’” says the two-time Rock & Roll Hall of Famer.

“Which at the time was a pretty radical thing to have ethnic names. People still Anglicized their names … So that was a big deal.”

And with that, Simon & Garfunkel would begin their legendary folk-rock run.

“And so,” Simon says, “we went in and we recorded our first album, ‘Wednesday Morning, 3 A.M.’”