How long have people been complaining about todays music?

People today say music isn't like it was in the 1990's and sometimes before especially rap which was better in the 1990's and soul music which hasn't even existed since the 80's before tramps like Beyonce,Rihanna you had Diana Ross,Whitney Houston,Stepphanie Mills.People hate Justin Bieber,Nicki Minaj and mainstream music.When did people start hating mainstream music.