The song Green Onions by Booker T and the MGs is without doubt one of the major rock and soul instrumentals to come out of the 1960s. According to a review on AllMusic.Com it is “one of the most popular instrumental rock and soul songs ever.” The song is based on a classic twelve-bar blues progression fused with jazz and features Booker T. Jones on Hammond organ, Al Jackson Jr. on drums, Steve Cropper on Fender Telecaster guitar and Lewis Steinberg on bass guitar. The four, particularly once Donald "Duck" Dunn took over bass duties, they were the classic Booker T and the MGs. Add the Memphis Horns and they were the Mar-Keyes. But more often than not, they were the uncredited house band. But together or individually they were the backbone of Memphis soul music. They were not just the musicians playing behind the soul stars — they helped write, arrange and produce many of the Stax hits. They cooked with more than just Green Onions. If it was on Stax Records they were probably there playing.