I want to know the answer to the following question:
What two genres cut into hard rock's popularity at the end of the 1980s and early 1990s?
All the background I'm provided with is that "Established bands made a comeback in the mid-1980s and it reached a commercial peak in the 1980s, with glam metal bands like Bon Jovi and Def Leppard and the rawer sounds of Guns N' Roses, which followed up with great success in the later part of that decade.". Is that enough to answer the question?