Mariah Carey & Boyz II Men - "One Sweet Day"

Two of the most powerful acts of the early-1990s teamed up for a ballad that became one of the longest running and most successful number one song of all time.  "One Sweet Day" by Mariah Carey and Boyz II Men hit the radio in November 1995 and held the #1 spot for 16 consecutive weeks.  The Adult Contemporary format was built on power ballads, and "One Sweet Day" set the standard.