1) A genre in music and other forms of media that is often defined by widely-accepted and currently-popular standards, trends, and hypes that have been established by the media, typically resulting in the promotion of superficial traits.
Very few mainstream artists are worth listening to.
"Swimming in the mainstream- Is such a lame, lame dream." - Rollins/Black Flag
During the "Golden Years" of a mainstream topic, the genre recieves praise in record numbers, often represented by record numbers of identity-free morons with nothing to make themselves "stand out". It gains brief immortality during this phase, with not enough love, and not enough hate to dislodge it.
Only when the "haters" prevail in larger numbers in proportion to fans will the death sentence of a genre be finalized.
Very devilish plan indeed...