how well do you know music

are you a music pro or just a rookie

1 who sings the original of hallelujah
2 what is the most covered song ever
3 what band sings many of the bbc's songs often in documentaries like 'life or many other david attenborough nature programs
4 who invented autotune
5 when was the first cd released
6 which band made the album 'bigger than jesus'
7 whilst alexandre berk was at number 1 with halelujah how many other versions were in the chart1