After the controversy surrounding her health and low-charting albums, Carey returned to prominence in 2005 with her album “The Emancipation of Mimi.” The album’s second song, “We Belong Together,” is the second-longest-running No. 1 song in U.S. chart history, just behind her 1996 duet with Boyz II Men, “One Sweet Day.” MORE: ‘Emancipation’ achieved, if not rewarded (Stan Honda / AFP / Getty Images)