Question: who sang the song knock knock knocking on heavens door
Answer: Guns N' Roses; G N' R; GNR; Guns and Roses; Bob Dylan; Bob Dylan; Bob Landy; Lucky Wilbury; Robert Allen Zimmerman; Alias; Robert Milkwood Thomas; Elston Gunn; Jack Frost; Robert Zimmerman; Robert Dylan; Blind Boy Grunt; Tedham Porterhouse; Sergei Petrov; Boo Wilbury