The harmonic development in bebop is often traced back to a moment experienced by Charlie Parker while performing "Cherokee" at Clark Monroe's Uptown House, New York, in early 1942. "I'd been getting bored with the stereotyped changes that were being used...and I kept thinking there's bound to be something else. I could hear it sometimes. I couldn't play it...I was working over 'Cherokee,' and, as I did, I found that by using the higher intervals of a chord as a melody line and backing them with appropriately related changes, I could play the thing I'd been hearing. It came alive." Gerhard Kubik postulates that harmonic development in bebop sprang from blues and African-related tonal sensibilities rather than 20th-century Western classical music. "Auditory inclinations were the African legacy in [Parker's] life, reconfirmed by the experience of the blues tonal system, a sound world at odds with the Western diatonic chord categories. Bebop musicians eliminated Western-style functional harmony in their music while retaining the strong central tonality of the blues as a basis for drawing upon various African matrices."