Simple past tense and past participle of duet.(verb)
Wiktionary.org : Text is available under the Creative Commons Attribution-ShareAlike License
Use "dueted" in a sentence
"Ashford and Simpson, who married in 1974, were quickly signed to Motown Records and wrote a string of hits for, among others, Diana Ross, Marvin Gaye and Tammi Terrell — the latter two who dueted on "Ain't No Mountain High Enough," "Ain't Nothing Like the Real Thing," "You're All I Need to Get By" and "Your Precious Love.""
"That song was written by Ewan MacColl, the father of Kirsty MacColl, who of course dueted with the Pogues on that unlikeliest of holiday classics, "Fairytale of New York.""
"After some introspection, the show took a turn for the Feival, and Fallon and Colbert dueted on "Somewhere Out There" for a Rondstadt-flavored ode to their lost love."