Mars now has 10 different songs to have topped Billboard's Hot 100 in his career. Karp is leaving Billboard after nearly a decade at the publication, with editors Jason Lipshutz and Leila Cobo tapped ...

The 33-year-old American singer and actor has achieved what many can only ever dream of- reaching professional success in not one, but two artistic endeavors. The song you probably know (you know, the ...