Parker's style of composition involved interpolation of original melodies over existing jazz forms and standards, a practice known as contrafact and still common in jazz today. Examples include "Ornithology", also known as "How High The Moon" and "Yardbird Suite", the vocal version of which is called "What Price Love", with lyrics by Parker. The practice was not uncommon prior to bebop, but it became a signature of the movement as artists began to move away from arranging popular standards and toward composing their own material.