I'm sure way back I must of run across this. Jerry Mathers had a pop group, and apparently he sang lead. Not too bad, for a actor, giving singing a shot. From 1966. He'd be 18.
https://m.youtube.com/watch?v=KzBlwREVe-U

On TNLITB it's brought up.
https://m.youtube.com/watch?v=gzwDlQDGKZ0

Richard Correll was a member of the band too.

song is written by Beav & Richard
cool Beav had a 64 GTO too !

pretty hip sound - sounds like a Lou Reed number ! really
cool guitar jam in it for sure

“Happiness is… goin' about a hundred-and-ten… blowing your mind, and coming, coming back down again…"Who’da thunk it?!? A tough-as-nails 60’s garage ultra-rarity - from the Beav! This is the first ever reissue of a blistering garage cut with lead vocals by the Beaver himself! Jerry Mathers circa 1966! It’s got the grit of Eddie Haskell, but it’s the voice of the Beave! Gold vinyl packaged in a space age envelope style sleeve with liner notes penned by Jerry himself.

Cut by Kevin Gray at Cohearent Audio.

from METV:
All-American boy Theodore "Beaver" Cleaver is best known for saying "Golly" and "Gee." Television audiences watched Jerry Mathers come of age in the role, as he grew from age nine to 15 years old. But those fans who kept paying attention to Mathers after Leave It to Beaver concluded witnessed a far more drastic maturation.

A few years after the series ended, Mathers entered a recording studio. He stepped to the microphone — his voice drenched in reverb with a faint echo of Bob Dylan — and snarled, "Happiness is goin' about a 100 / Blowin' your mind and comin' back down again!" Beaver singing about speeding and recreational highs over a clattering rock 'n' roll racket? Well, it was a far cry from "Gee, Wally!"

But Mathers hardly distanced himself from that iconic TV kid. Shucks, he called his group Beaver and the Trappers.

The small White Cliffs label originally pressed the band's lone single, "Happiness Is Havin'" / "In Misery," in 1966. Last year, Modern Harmonic Records re-released the seven-inch.

Mathers reminisced about his garage-rock days on the back of the sleeve. "I would go out on stage [at county fairs and amusement parks] with the band, sing my songs and few other current pop hits, and then autograph photos and records for the many fans," he recalled. "This was my summer job and I bought my first car, a '64 GTO." The former child-star was in high school at the time.

Beaver and his band even played on the Sunset Strip at the Whiskey-a-Go-Go, just like the Doors and Mötley Crüe. After you listen to the proto-punk-ish tune, that sentence is not strange as it looks on paper. Take a listen.

Scott Hettrick, who put the New Beav snippet together, is the guy who put all the New Beavs on Youtube.