House music originated in Chicago in the early 1980s, developing from disco music played in clubs like the Warehouse. Key early artists included Frankie Knuckles. Popular modern house artists are Avicii, Swedish House Mafia, and Tiësto. There are awards like the Grammys that recognize achievements in house music. House is characterized by pumping basslines, synth leads, and chunky beats that build up to a bass drop and then resume the fast pace. The clothing of house DJs is casual as they are not the primary focus in dark clubs.