Towards the end of the 1930s the roles of the piano, bass, and drums in the rhythm section changed significantly under the influence of the Count Basie Orchestra. Early swing drumming relied heavily on the bass and snare drums, with a secondary role for the high hat cymbal in timekeeping. Jo Jones inverted that relationship, making the high hat the primary timekeeper and using the bass and snare drums for accents and lead-ins. Basie introduced a rhythmically sparse style of piano playing emphasizing accents, lead-ins, and fills. Both of those changes increased the importance of the bass and guitar in timekeeping, ably held by Walter Page and Freddie Green. The lighter and sparser, yet more dynamic, sense of rhythm expressed by the Basie rhythm section lent greater freedom for the band's soloists and set a trend that would culminate in the rhythmic ideas of bebop.