“Afro Blue” is notable for its Afro-Cuban feel, which also makes it difficult to play. It can be arranged in 6/8 or 3/4 time. If it is arranged in 6/8, it has a strong quarter note triplet feel; if it is arranged in 3/4, it has a strong dotted quarter note feel. All these factors give the piece a complex, smooth-sounding beat. (Wikipedia)