Boyz II Men is an American R&B vocal group, best known for emotional ballads and a cappella harmonies. They are currently a trio composed of baritone Nathan Morris, alongside tenors Wanya Morris and Shawn Stockman.
Lady Gaga is an American singer, songwriter, and actress. With global album and single sales of 28 million and 140 million respectively, as of April 2015, she is one of the best-selling musicians of all time.
Christina Aguilera rose to prominence with her 1999 self-titled debut album that spawned the Billboard Hot 100 number one singles "Genie in a Bottle", "What a Girl Wants", and "Come on Over Baby (All I Want Is You)".