What happened to American music over the years?

A few years ago when u heard a song u could tell its origin u could feel the guitar and drums and pianos playing the music.... but now popular songs have computerized beats and music is spoiled by Deejays ...... i will give u examples . lady gaga katy perry usher kanye west kesha justin bieber flo rida and all the rappers they dont play music they just sing useless lyrics about fake love . hos . clubs and partying singers are supposed to write great songs about love and their music should not be played by a machine .... pop legends like elton john and frank sinatra are getting less and less popular by the day only because of rap and hip hop music spreading ... why do u people worship them??