Pop-rap (also known as pop rap and hip pop) is a genre of music fusing the rhythm-based lyricism of hip hop music with pop music's preference for melodious vocals and catchy tunes, which gained mainstream popularity during the 1990s. The lyrics are often lighthearted, with choruses similar to those heard in pop music. The influences and roots of pop rap trace back to late 1980s hip hop artists, such as Run DMC, LL Cool J, and Beastie Boys.