Oscar Peterson was a Canadian jazz pianist and composer. He was called the "Maharaja of the keyboard" by Duke Ellington, but simply "O.P." by his friends. He released over 200 recordings, won eight Grammy Awards, and received numerous other awards and honours. He is considered one of the greatest jazz pianists, and played thousands of concerts worldwide in a career lasting more than 60 years.

Peterson made numerous duo performances and recordings with bassists Ray Brown, Sam Jones, and Irving Ashby, Herb Ellis, and Barney Kessel, pianists Count Basie, Herbie Hancock, Benny Green, and Oliver Jones, trumpeters Clark Terry and Louis Armstrong, and many other important jazz players.

Peterson redefined the jazz trio by bringing the musicianship of all three members to the highest level. Together with Joe Pass (guitar) and Niels-Henning Ørsted Pedersen (bass), Oscar Peterson (piano) called the trio in his own words, 'the most stimulating' and productive setting for public performances as well as in studio recordings.

The Trio is a 1973 live recording at the London House in Chicago. Winner of the 1975 Grammy Award for "Best Jazz Performance By A Group", this energetic live set is the highlight of all three storied careers.

In his Allmusic review, critic Scott Yanow complimented the playing of Pass and Pedersen, but wrote "the reason to acquire this set is for the remarkable Oscar Peterson. The pianist brilliantly investigates several jazz styles... Peterson really flourished during his years with Norman Granz's Pablo label, and this was one of his finest recordings of the period."