Simplify the following text for a Grade 8 native English-speaking person.
Original: Mainstream music denotes music that is familiar and unthreatening to the masses , as for example popular music , pop music , middle of the road music , pop rap or pop rock ; Mainstream jazz is generally seen as an evolution of be-bop , which was originally regarded as radical .
Simplified: Mainstream music refers to music that is familiar to and popular with the majority of people in their culture . For example , popular music or pop music .