Pianist Cecil Taylor was also exploring the possibilities of avant-garde free jazz. A classically trained pianist, Taylor's main influences included Thelonious Monk and Horace Silver, who prove key to Taylor's later unconventional uses of the piano. "Jazz Advance", his album released in 1956 for Transition showed ties to traditional jazz, albeit with an expanded harmonic vocabulary. But the harmonic freedom of these early releases would lead to his transition into free jazz during the early 1960s. Key to this transformation was the introduction of saxophonist Jimmy Lyons and drummer Sunny Murray in 1962 because they encouraged more progressive musical language, such as tone clusters and abstracted rhythmic figures.