According to Wiki:
John Sebastian – vocals, guitar, harmonica, autoharp, piano
David Hungate – bass
Richard Bell – piano, clavinet
Jeff Porcaro – drums
Jeff "Skunk" Baxter – pedal steel guitar
Welcome Back (John Sebastian album) - Wikipedia
Regarding the song:
TV producer Alan Sachs wanted a Lovin' Spoonful-like theme song for a new ABC sitcom entitled
Kotter. Sachs's agent, Dave Bendett, also represented Sebastian and arranged for a meeting between the two.[
citation needed]
Initially, Sebastian had considerable difficulty with the lyrics since including the title character's name didn't lend itself to a sufficient number of obvious rhymes.
Instead, Sebastian decided to focus the lyrics on the idea of the series' premise of Kotter returning to the very place he grew up and having dreamt of leaving to do something positive.[
citation needed]
The producers liked the resulting song so much that they changed the name of the series to
Welcome Back, Kotter.
Co-produced by Steve Barri and Sebastian, the song eventually sold over one million copies.[
citation needed]
The song originally had one verse, meant for the TV series.
Because of the popularity of the show, Sebastian, in the single version, added a second verse to the song, as well as an instrumental section featuring a harmonica solo, before he resumed finishing up the verse, as well as the repeated chorus and coda to finish the song.
The single version would eventually be used during the closing credits of
Welcome Back, Kotter.[
citation needed]
Some final season episodes have played the entire song, less the instrumental section, as the closing credits rolled.
Welcome Back (John Sebastian song) - Wikipedia
Some song info from Songfacts:
Link Removed
I was working on a project and our teamster, (who would have been in his thirties at the time) was a cop that was also moonlighting as a limo driver told us around 1992 , that he was driving the Lovin' Spoonful to a concert, when they started lighting up joints on the way.
He said instead of driving them to to the venue, he drove them straight to the police station instead.
We all believed him then, but I since have read that one of the band mates was responsible for the bust.
I tried to figure out why he would say that and the only logical explanation I came up with was he was trying spread the story around that he was such a mean and dedicated cop/ex-cop, he even busted a band called The
"LOVIN' " Spoonful, during the 'Summer Of
LOVE ', so don't mess with him....?