Bow down to one of the best.

"Crying Time" with Ray Charles (1973)

This performance aired in the early '70s on Streisand's fifth television special, Barbra Streisand...And Other Musical Instruments. She also sang "Look What They've Done To My Song, Ma" and "Sweet Inspiration" / "Where You Lead" with Charles on this special.

CBS / Via youtube.com

"You Don't Bring Me Flowers" with Neil Diamond (1980)

This song was originally released in 1978 as a single, and performed at the 1980 Grammy Awards by the Brooklyn natives.

CBS / Via youtube.com

"Get Happy" / "Happy Days Are Here Again" with Judy Garland (1963)

Quite possibly one of the most legendary duets of all time. Streisand appeared on The Judy Garland Show in 1963 at the rise of her fame -- her and Garland performed a medley together, as well as an impromptu performance with Ethel Merman.

CBS / Via youtube.com