ボサノヴァ
Bossa nova has at its core a rhythm based on samba. Samba combines the rhythmic patterns and feel originating in former African slave communities. Samba's emphasis on the second beat carries through to bossa nova (to the degree that it is often notated in 2/4 time). However, unlike samba, bossa nova has no dance steps to accompany it. When played on the guitar, in a simple one-bar pattern, the thumb plays the bass notes on 1 and 2, while the fingers pluck the chords in unison on the two eighth notes of beat one, followed by the second sixteenth note of beat two. Two-measure patterns usually contain a syncopation into the second measure. Overall, the rhythm has a "swaying" feel rather than the "swinging" feel of jazz. As bossa nova composer Carlos Lyra describes it in his song "Influência do Jazz", the samba rhythm moves "side to side" while jazz moves "front to back". Bossa nova was also influenced by the blues, but because the most famous bossa novas lack the 12-bar structure characteristic of classic blues, as well as the statement, repetition and rhyming resolution of lyrics typical of the genre, bossa nova's affinity with the blues often passes unnoticed.