Best of Both Worlds: Top 15 Musical Collaborations

It seems like singers are collaborating more than ever these days. Here are our favorite duets of all time.

Music has always been a bit better when two great minds come together, and few partnerships have blended pitch-perfect harmony quite like Brandy and Monica.

Their 1998 duet "The Boy Is Mine" is a certified R&B classic, and on their latest, "It All Belongs to Me," the two recreate the vocal chemistry we love all over again.

As Monica readies for the release of her new album New Life today, here's a look at the 15 most memorable collaborations.

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