Since record sales often depended on dance floor performances by DJs at major nightclubs, DJs were also important in the development and popularization of disco music. Some DJs were also record producers who created and produced disco tracks in the recording studio. During the disco era, many nightclubs commonly hosted disco dancing competitions or offered free dance lessons. His book The Complete Guide to Disco Dancing was the first to name, break down and codify popular disco dances as dance forms and distinguish between freestyle disco, partner and line dancing. The pair spent the week teaching disco to dancers at nightclubs. Interest in disco also helped spawn television dance competition programs such as Dance Fever. Less commonly, some disco dancers wore extravagant costumes, dressed in drag, covered their bodies in gold or silver paint, or wore very revealing clothing leaving them almost naked; these unusual outfits were more likely to be seen at loft parties and invitation-only New York City nightclubs. During the early 1980s, dance music abandoned the complicated song structure and orchestration that characterized disco