Mitchell Herbert Ellis was an American jazz guitarist. During the 1950s, he was in a trio with pianist Oscar Peterson.

Oscar Emmanuel Peterson was a Canadian jazz pianist and composer. Considered a virtuoso and one of the greatest jazz pianists of all time, Peterson released more than 200 recordings, won eight Grammy Awards, as well as a lifetime achievement award from the Recording Academy, and received numerous other awards and honours. He played thousands of concerts worldwide in a career lasting more than 60 years. He was called the "Maharaja of the keyboard" by Duke Ellington, simply "O.P." by his friends, and informally in the jazz community, "the King of inside swing".