House music grew out of the post-disco dance club culture of the early 1980s. After disco became popular, certain urban DJs, particularly those in gay communities, altered the music to make it less pop-oriented. The beat became more mechanical and the bass grooves became deeper, while elements of electronic synth pop, Latin soul, dub, rap, and jazz were grafted over the music's insistent, unvarying 4/4 beat. Frequently, the music was purely instrumental and when there were vocalists, they were faceless female divas that often sang wordless melodies.