Simplify the following text for a Grade 8 native English-speaking person.
Original: Her book The Complete Guide to Disco Dancing ( Warner Books , 1978 ) was the first to name , break down and codify popular disco dances as a dance form and distinguish between disco freestyle , partner and line dances .
Simplified: The word `` disco '' is also used to refer to the style of dancing that people do to disco music , or to the style of clothes that people wear to go disco dancing .