First performed by Paul Williams (TV commercial 1969).
First commercial release by Freddie Allen (1970).
Hit versions by The Carpenters (US #2/MOR #1/CAN #1/UK #28 1970), Curtis Mayfield (US ALBUM #21/R&B #3/JAZZ #9 1971).
From the wiki: “‘We’ve Only Just Begun’ was written by Roger Nichols (music) and Paul Williams (lyrics). The song debuted in a wedding-themed TV commercial for Crocker National Bank in California with Williams on vocals. The first commercial single release was originally recorded by Smokey Roberds under the name ‘Freddie Allen’. Roberds had had previous hit song experience, with the group The Parade who charted ‘Sunshine Girl’ into the US Top-20 in 1967.
“When Roberds had heard the ‘We’ve Only Just Begun’ TV commercial, he phoned Nichols, his friend, ascertained that Nichols had indeed co-written it, and then asked Nichols to create a full-length version. Nichols and Williams did so, with Roberds intending to produce it for a band he had just signed to White Whale Records. The band deal fell through; Roberds decided to record the song himself, but couldn’t do so under his stage name for contractual reasons. According to Roberds, his Country-Pop recording of ‘We’ve Only Just Begun’ did well in California but not nationally – which he attributed to promotion and distribution problems.