DONNA SUMMER & BARBRA STREISAND ”No More Tears” 1979
The first minute’s as slow and schmaltzy as a B-grade Barbra solo number — but then the song bursts into an ecstatic disco anthem.
REBA McENTIRE & LINDA DAVIS ”Does He Love You” 1993
A woman (McEntire) has a frank dialogue with her husband’s mistress in this weepy country-pop ballad.
BRANDY & MONICA ”The Boy Is Mine” 1998
Crystal-clear harmonies, swirling Philly-soul strings, and a rumored real-life rivalry between the teen singers made this a megahit.
EVE & GWEN STEFANI ”Let Me Blow Ya Mind” 2001
The rapper and the poppy No Doubt star complement one another’s styles surprisingly well in this breezy hip-hop cut.
BRITNEY SPEARS & MADONNA ”Me Against the Music” 2003
The combined efforts of two generations of MTV royalty aren’t nearly enough to save this overproduced club mess.
BEYONCÉ & SHAKIRA ”Beautiful Liar” 2007
Melding their unique voices over this Middle Eastern-tinged track, the ladies form an alliance against yet another two-timing guy. How hypnotic is it when they chant their own names?!