Which of the following is a group of renowned pianists?

This group includes musicians from different genres: Eric Clapton is a renowned guitarist and rock musician, Gary Karr is a double bassist, and Maria Callas was a famous opera singer. None of these individuals are primarily recognized as pianists, making this grouping irrelevant to the question.

While Jascha Heifetz and Isaac Stern are renowned violinists, Duke Ellington is a legendary jazz pianist and bandleader. However, this group does not consist solely of pianists, as it includes prominent figures from string instrument backgrounds, thus failing to meet the criteria of the question.

Keith Jarrett is a celebrated jazz pianist, but Django Reinhardt was a gypsy jazz guitarist, and Hector Berlioz was a composer and conductor, not a pianist. This mix of talents does not fulfill the requirement of the question, which seeks a group exclusively of pianists.

Glenn Gould is a famous pianist known for his interpretations of Bach, but Miles Davis was a trumpet player and jazz musician, while Keith Moon was a drummer for The Who. This combination again lacks the focus on pianists, as it includes musicians from entirely different disciplines.