Who sang the song the day the music died?
McLean's number 1 successes in Europe and Australia led to a new deal in the United States with Millennium Records, which issued "Chain Lightning" two and a half years after it had been recorded in Nashville and two years after its release in Europe. It charted on February 14, 1981, and reached number 28, and "Crying" climbed to number 5 on the pop singles chart. Orbison himself thought that McLean's version was the best interpretation he'd ever heard of one of his songs. Orbison thought McLean did a better job than he did and even went so far as to say that the voice of Don McLean is one of the great instruments of 20th-century America. According to Brian Wilson of the Beach Boys, "McLean's voice could cut through steel - he is a very pure singer and he's up there with the best of them. He's a very talented singer and songwriter and he deserves his success."
Who sang lead on the original song featuring lyrics the day the music died?
Donald McLean III Don McLean
Don McLean
No context provided
Which group sand backup on the original song featuring lyrics the day the music died?
West Forty Fourth Street Rhythm and Noise Choir
The Day the Music Died (disambiguation)
https://en.wikipedia.org/wiki/The%20Day%20the%20Music%20Died%20%28disambiguation%29
Don McLean
https://en.wikipedia.org/wiki/Don%20McLean
"American Pie" is a song by American singer and songwriter Don McLean. 
American Pie (song)
The repeatedly mentioned phrase "the day the music died" refers to the plane crash in 1959 that killed early rock and roll stars Buddy Holly, The Big Bopper, and Ritchie Valens, and ended the era of early rock and roll
American Pie (song)
"American Pie" is a song by American singer and songwriter Don McLean that features McLean on lead vocals and West Forty Fourth Street Rhythm and Noise Choir singing backup. The song "American Pie" repeatedly mentions the phrase "the day the music died." This phrase refers to the plane crash in 1959 that killed early rock and roll stars Buddy Holly, The Big Bopper and Ritchie Valens, thus ending the era of early rock and roll.