"In documentary Good Ol' Freda, the former secretary, 68, reveals that John Lennon confided in her that he thought he would die young.
‘The first thing that came into my mind [when he died] was that he used to say: 'I won't be here when I'm 40. I won't make 40,' she told the Guardian."
http://www.dailymail.co.uk/tvshowbiz/article-2509358/New-Beatles-video-clip-emerges-bands-cover-Buddy-Hollys-Words-Love.htmlJohn Lennon - Wikiquote
en.wikiquote.org/wiki/John_Lennon
Then as now, there is bound to be some rivalry between various bands & artists.
http://www.dailymail.co.uk/tvshowbiz/article-1344869/Why-Tom-Jones-Elvis-Presley-wanted-beat-John-Lennon.html
The myth that Jim Morrison like Elvis, lived years beyond their official day of death might help to sell their music.
http://www.unexplained-mysteries.com/forum/index.php?showtopic=26943,
http://elvisforver.tripod.com/id3.html
If Buddy Holly had lived a decade longer, he might have become just as popular as Elvis & The Beatles. The sound of the 1960s would have been a little wider on the sonic spectrum. http://en.wikipedia.org/wiki/The_Day_the_Music_Died#The_plane
Perhaps the same could be said about Jimi_Hendrix, because he would have blown the 1970s music scene into the stratosphere.
Then again, if Jim_Morrison had lived a decade longer, there might have been another 2 or 3 Doors albums, without the need or interest to go on tour again.
The day the music died can be applied to certain musicians & bands at certain points in time. Its a matter of what band & music one likes.