"Knock on Wood" is a 1966 hit song written by Eddie Floyd and Steve Cropper and originally performed by Eddie Floyd. The Eddie Floyd version peaked at #28 on the Hot 100 and spent one week at #1 on the Soul Singles chart.
Amii Stewart recorded a disco version of the song, serving as her debut single which reached #1 in the U.S. charts in April 1979, as well as charting on the soul singles and disco charts, becoming the best-known version of the song. The song was co-produced by Simon May. It also reached the Top 10 twice in the UK, first in 1979 (#6) and a remixed version reached #7 in 1985. Amii's version was featured in the 1998 film The Last Days of Disco.