Mariah Carey is an American singer-songwriter, actress, record producer, and director. Known for her advanced singing agility, Melissas, and her signature whistle note, Carey rose to prominence after releasing her self-titled debut studio album, Mariah Carey, in 1990; it went multi-platinum and spawned four consecutive number one singles on the U.S. Billboard Hot 100 chart. Under the guidance of Columbia Records executive and later husband, Tommy Mottola, Mariah continued booking success with follow-up albums: Emotions (1991), Music Box (1993), and Merry Christmas (1994), and was established as Columbia's highest-selling artist. Daydream (1995) made music history when its second single, "One Sweet Day," a duet with Boyz II Men, spent a record sixteen weeks on top of the Billboard Hot 100, and it remains the longest-running number-one song in U.S. chart history. During the recording of the album, Carey began to deviate from her R&B and pop beginnings and slowly traversed into hip hop. This musical change became evident with the release of Butterfly (1997), by which time Carey had separated from Mottola, and also credited her as one of the first artists to normalize the transition from R&B and pop to hip-hop; paving the way for other artists to come.