Extended Keywords: Parker played a leading role in the development of bebop, a form of jazz characterized by fast tempos, virtuoso technique, and improvisation based on harmonic structure. Parker's innovative approaches to melody, rhythm, and harmony exercised enormous influence on his contemporaries. Several of Parker's songs have become standards, including "Billie's Bounce", "Anthropology", "Ornithology", and "Confirmation". He introduced revolutionary harmonic ideas including a tonal vocabulary employing 9ths, 11ths and 13ths of chords, rapidly implied passing chords, and new variants of altered chords and chord substitutions. His tone was clean and penetrating, but sweet and plaintive on ballads. Many Parker recordings demonstrate dazzling virtuosic technique and complex melodic lines. Charlie Parker didn't visit no crossroads he lived their.