Eddie Cochran's "Summertime Blues" was just nine years old in 1967, but music had evolved so quickly over that time it seemed like a golden oldie. San Francisco hard rock trio Blue Cheer began playing an aggressive rendition of the song that helped pave the way for heavy metal, and the Who also added it into their set list. It was a wonderful showcase for John Entwistle's thunderous bass, and his deep singing voice was perfect for the intolerant authority figures in the song. They played the song at Monterey Pop in 1967, but when the band hit Leeds three years later the song had reached another level of Who-ness. They kept in the set list for decades, but wisely haven't touched it since Entwistle's final gig in 2002.