J-pop is an abbreviation for Japanese pop, but is also a loosely defined musical genre that entered the musical mainstream of Japan in the 1990s. Modern "J-pop" has its roots in 1960s music such as The Beatles and replaced kayōkyoku (Japanese pop music until 1980s) in the Japanese music industry. It now refers to Japanese domestic popular music, and was coined by the Japanese media to distinguish Japanese music from foreign music. Today, the Japanese music industry is the second largest in the world, behind the United States.