Back in the late 50's, when that accident happened, there were only a select few of musicians that were as popular as Buddy Holly, Ritchie Valens and the Big Bopper. The biggest was Elvis, but I think he was in the Army at the time. When those 3 guys died, that delivered a huge blow to the rock world. Three of it's brightest stars were gone. Buddy Holly, as it's been said many times, may have been bigger than Elvis had he lived, and he was only beginning to show what he could do. Ritchie Valens was on the bring of superstardom, not to mention that he was only 17 years old when he died, so no one can really know what greatness he had to come. The Big Bopper did have that one song, "Chantilly Lace", but who knows if more songs were going to be popular.
"The day the music died" is truly that in my book. If you remember the song "American Pie", the one line goes, "the jester stole the king's crown", that refers to Elvis stealing Buddy Holly's crown, because Buddy Holly, at the time, was as big as, or bigger than Elvis, and after he died, Elvis had basically no competitors left, until the Beatles came along in 1964. Feb. 3, 1959 is truly the worst day in American rock music history.