Oscar Peterson was one of the greatest piano players of all time. A pianist with phenomenal technique on the level of his idol, Art Tatum, Peterson's speed, dexterity, and ability to swing at any tempo were amazing. Very effective in small groups, jam sessions, and in accompanying singers, O.P. was at his absolute best when performing unaccompanied solos. His original style did not fall into any specific idiom. Like Erroll Garner and George Shearing, Peterson's distinctive playing formed during the mid- to late '40s and fell somewhere between swing and bop. Peterson was criticized through the years because he used so many notes, didn't evolve much since the 1950s, and recorded a remarkable number of albums,as Quartet Vol.2.