From the beginnings of rhythm in prehistoric times to the great composers of the Baroque, Classical and Romantic periods of music. Until the 20th century the only acceptable means of musical expression in the western world was the symphonic orchestra, choral groups and combinations of both. With the innovation of jazz and blues, music took an alternate route, where the musician did not have to be formally taught his trade. His feelings ruled his fingers and his misfortunes gave breath to his words. Since then the quality of music has slowly been declining in all aspects and types.
People lose touch with the past and their roots.
I must say that many things lead me to believe that music is dead. Bands that play just for the sake of playing. Appearances don't mean shit when you can't play more than three chords in a song or write lyrics that are worth the piece of paper they're written on. There is a band for everyone and an audience for any band. So go out and check out the music.