Paul Simon probably never had a vocal partner quite like Bobby McFerrin, who coaxed him on stage for an impromptu performance of a Simon and Garfunkel hit - the highlight of opening night of Jazz at the Lincoln Centre's 25th anniversary season.
In his unique style, McFerrin had just started singing Scarborough Fair at the New York concert - singing the lyrics while using his voice as a musical accompaniment - when he suddenly stopped to say that someone had spotted Simon in the audience.
"I don't know really how you feel about improv, but there's an extra microphone over there," he said to Simon.
Simon initially demurred. But with the audience cheering, McFerrin said in a high-pitched falsetto: "I just think you can sing this one better than I can."
"How could you do that to me," Simon said good-naturedly as he joined McFerrin on stage at the Rose Theatre for an unexpected guest turn.
But McFerrin quickly proved that he was no Art Garfunkel, whose tight vocal harmonies with Simon turned Scarborough Fair and other songs into 1960s hits.
Simon quickly adjusted to McFerrin's loose, irreverent style as they echoed each other's lines, broke up the lyrics and adapted their singing to saxophonist Ted Nash's arrangement of the Simon song for the Jazz at Lincoln Centre Orchestra.
The evening's programme, My Audio Biography, featured McFerrin reconnecting with what he considers touchstones in his musical life: spirituals taught to him by his father Robert, the first black man to sing at the Metropolitan Opera; rhythm and blues and funk tunes; a movement from Beethoven's Symphony No 7, and bebop - Charlie Parker's Donna Lee that featured a rapid-fire vocalese-trumpet duo with Marsalis.
McFerrin chose not to perform his biggest pop commercial hit, Don't Worry Be Happy.