"1-2-3" is a 1965 song recorded by American blue-eyed soul singer Len Barry, who co-wrote it with John Madara and David White (the latter two produced the recording).

[1] The writers were sued by Motown at the time, claiming that the song is a reworking of Holland–Dozier–Holland's "Ask Any Girl" released by the Supremes as the B-side to their single "Baby Love" the year before.

They denied the claim, but after two years of litigation, agreed to give the Motown writers 15% of the song's writing and publishing royalties.

[3] The personnel on the original recording included Vinnie Bell, Bobby Eli, and Sal DiTroia on guitars; Joe Macho on bass; Artie Butler on percussion; Leon Huff on piano; Artie Kaplan on sax; Bill Tole and Roswell Rudd on trombones; Lee Morgan on trumpet; Fred Hubbard on clarinet; and Bobby Gregg on drums.

[6] Overseas, the song peaked at number 3 on the UK Singles Chart.