In music, syncopation is a variety of rhythms played together to make a piece of music, making part or all of a tune or piece of music off-beat. More simply, syncopation is "a disturbance or interruption of the regular flow of rhythm": a "placement of rhythmic stresses or accents where they wouldn't normally occur". It is the correlation of at least two sets of time intervals. Syncopation is used in many musical styles, especially dance music. According to music producer Rick Snoman, "All dance music makes use of syncopation, and it's often a vital element that helps tie the whole track together". Syncopation can also occur when a strong harmony is simultaneous with a weak beat, for instance, when a 7th-chord is played on the second beat of measure or a dominant chord is played at the fourth beat of a measure. The latter occurs frequently in tonal cadences for 18th- and early-19th-century music and is the usual conclusion of any section. A hemiola (the equivalent Latin term is sesquialtera) can also be considered as one straight measure in three with one long chord and one short chord and a syncope in the measure thereafter, with one short chord and one long chord. Usually, the last chord in a hemiola is a (bi-)dominant, and as such a strong harmony on a weak beat, hence a syncope. Types of syncopation Technically, "syncopation occurs when a temporary displacement of the regular metrical accent occurs, causing the emphasis to shift from a strong accent to a weak accent". "Syncopation is", however, "very simply, a deliberate disruption of the two- or three-beat stress pattern, most often by stressing an off-beat, or a note that is not on the beat." Suspension For the following example, there are two points of syncopation where the third beats are sustained from the second beats. In the same way, the first beat of the second bar is sustained from the fourth beat of the first bar. Though syncopation may be very complex, dense or complex-looking rhythms often contain no syncopation. The following rhythm, though dense, stresses the regular downbeats, 1 and 4 (in ): However, whether it is a placed rest or an accented note, any point in a piece of music that changes the listener's sense of the downbeat is a point of syncopation because it shifts where the strong and weak accents are built. Off-beat syncopation The