about bruno mars:
Peter Gene Hernandez (born October 8, 1985), known professionally as Bruno Mars, is an American singer, songwriter, record producer, multi-instrumentalist, and dancer. He is known for his stage performances, retro showmanship, and for performing in a wide range of musical styles, including pop, R&B, funk, soul, reggae, hip hop, and rock. Mars is accompanied by his band, The Hooligans, who play a variety of instruments, such as electric guitar, bass, piano, keyboards, drums, and horns, and also serve as backup singers and dancers.

about it will rain:
"It Will Rain" is a song recorded by American singer and songwriter Bruno Mars. It was released exclusively on iTunes on September 27, 2011 by Atlantic Records as the lead single from the soundtrack of the film, The Twilight Saga: Breaking Dawn – Part 1. Mars composed the song with his production team The Smeezingtons, and it was partially written during The Doo-Wops & Hooligans Tour in the United States, being finished after the singer watched an early version of the movie which inspired him. The soundtrack for The Twilight Saga: Breaking Dawn – Part 1 was a much expected release and Mars' song was chosen as the lead single by the album's executive producer, Alexandra Patsavas, to promote it. Musically, "It Will Rain" is a pop and pop-soul ballad. Its lyrics tell the agony and torment of a heartbreak and its various stages.
The music video, directed by Phil Pinto and Mars, prominently features the singer going through different emotions such as love and anger with his lover as they struggle through a break-up.