Here's the BS from Wikipedia:
The Banana Splits' bubblegum pop rock and roll was provided by studio professionals, including Joey Levine ("I Enjoy Being a Boy", "It's a Good Day for a Parade"); Al Kooper ("You're the Lovin' End"); Barry White ("Doin' the Banana Split"); Gene Pitney ("Two Ton Tessie") and Jimmy Radcliffe provided his songs ("I'm Gonna Find A Cave", "Soul", "Don't Go Away Go-Go Girl", "Adam Had 'Em" and "The Show Must Go On") but did not contribute vocals to Splits recordings. The music director was music publisher Aaron Schroeder while production duties were mainly handled by David Mook.
In 1968, The Banana Splits released an album titled We're the Banana Splits. The show’s theme song, titled "The Tra La La Song (One Banana, Two Banana)", released as a single, peaked at number 97 on Billboard's Top 100 in February 1969.[8] The version included on the We're The Banana Splits album is the same recording heard at the beginning of the show, while the single version is an entirely different arrangement and recording of the song, featuring an additional verse. The song was written by Nelson Brock Winkless, Jr., however, owing to contractual arrangements[citation needed], on all record releases (as well as the TV show's closing credits), credit given to Ritchie Adams and Mark Barkan. Winkless is credited as co-writer, along with Hoyt Curtin, of "The Beautiful Calliopa" (also called "My Beautiful Calliopasaxaviatrumparimbaclaribasotrombaphone"), which was featured several times in the television series and also issued on record.