Indie (rock) is genre of alternative that primarily exists in the independent underground music scene. It primarily refers to rock musicians that are or were unsigned, or have signed to independent record labels, rather than major record labels. Other related (and sometimes overlapping) categories include shoegazing and indie pop. Indie rock artists place a premium on maintaining complete control of their music and careers, releasing albums on independent record labels (sometimes their own) and relying on touring, word-of-mouth, and airplay on independent or college radio stations for promotion. Some end up moving to major labels, often on favorable terms won by their prior independent success.