On this day in music history: May 21, 1977 - “Sir Duke” by Stevie Wonder hits #1 on the Billboard Hot 100 for 3 weeks, also topping the R&B singles chart for 1 week on May 28, 1977. Written and produced by Stevie Wonder, it is fifth pop and thirteenth R&B chart topper for the twenty two time Grammy award winning singer, songwriter and musician. The song is written in tribute to legendary composer, arranger and bandleader Duke Ellington. Having been an influence on Wonder as a musician, he feels compelled to acknowledge Ellington who had passed away in May of 1974 at the age of 75. Stevie also name checks many other important jazz and swing music pioneers in the song including Count Basie, Glenn Miller, Louis Armstrong and Ella Fitzgerald. The track features Wonder (keyboards) with members of his band Wonderlove including Nathan Watts (bass), Michael Sembello and Ben Bridges (lead and rhythm guitars), Hank Redd (alto sax), Trevor Laurence (tenor sax), Raymond Maldonado, Steve Madaio (trumpets) and Raymond Pounds (drums). Issued as the second single from the landmark “Songs In The Key of Life” album on March 22, 1977, “Sir Duke” follows its predecessor “I Wish” to the top of the pop and R&B singles charts. Entering the Hot 100 at #74 on April 2, 1977, it climbs to the top of the chart seven weeks later. The success of “Sir Duke” drives “Songs In The Key Of Life” to 10x Platinum status in the US.