Richter gave the 1942 premiere of Sergei Prokofiev's Piano Sonata No. 6 -- the composer's first work in that form for years, and the first one he did not premiere himself. This resulted in wild acclaim for both performer and composer. Thereafter, Richter was a great proponent of Prokofiev's music, premiering also the Seventh and the Ninth Sonatas, the latter of which is dedicated to him. Though word of Richter's excellence (and occasional poor-quality recordings) had spread outside of Russia, his foreign engagements were limited to Eastern Bloc countries (and, in one case, China) where Soviet officials felt there was reduced risk of defection. However, his 1958 performance of Prokofiev's Fifth Piano Concerto with the Philadelphia Orchestra (on tour in Leningrad) generated such excitement that he was finally permitted to tour the United States, further bolstering his reputation as a virtuoso. Engagements in all of world's musical centers followed. Richter was known as a pianist of transcendent abilities, particularly adept at highlighting the nuances of different styles. Though his interests focused primarily on music of Beethoven, and Prokofiev, he was also highly regarded for his Schubert, Schumann, Bach, Debussy, and Ravel; and in the early 1960s he made a memorable recording of Benjamin Britten's Piano Concerto with the composer conducting.
Richter did not favor studio recordings; therefore, most of his recordings are from live performances. Many of them, particularly those from Soviet concerts, suffer from indifferent sound quality and excessive audience noise, but his playing had an electric quality that transcended these handicaps.
The pianist earned a reputation for being difficult and aloof. He was notoriously apt to cancel performances on whims, or arrive late without explanation or apology. However, those who heard him were rarely disappointed. He preferred intimate concert settings over big auditoriums, and thus returned many times to the Aldeburgh and Spoleto Festivals. He was the centerpiece of the Fêtes Musicales, held annually beginning in 1964 at Grange de Meslay, near Tours.
Among his greatest recordings are his Schubert sonatas, Rachmaninov and Prokofiev concertos, Liszt concertos (these have the benefits of first-rate sound), and his Schumann. He has also served as a chamber musician and accompanist, playing piano duets with Britten, and accompanying Elisabeth Schwarzkopf and Dietrich Fischer-Dieskau, among others.