No, Rap hardly led the charts. It may have really started then but it was still mostly fringe stuff.
http://www.80sxchange.com/80s_charts/1985.htm
As was "metal" and "hair" and all that other so-called music. Hair and metal bands did not rule, either. Never did, never will. Too bad so many people on the 'net can't see that. http://www.angelfire.com/wa2/heepsplace/revisionism.html
It's all opinion!
Hair metal was great. Not too serious, good guitar, fun lyrics, and cheesy videos. Better than the "save the world" crap from the 60s or the "I-hate-myself" rock of the 90s.