technique that DJs use that involves speeding up or slowing down a record (or CDJ player, a speed-adjustable CD player for DJ use) to match the tempo of a previous or subsequent track, so both can be seamlessly mixed. Having beatmatched two songs, the DJ can either seamlessly crossfade from one song to another, or play both tracks simultaneously, creating a layered effect. DJs often beatmatch the underlying tempos of recordings, rather than their strict bpm value suggested by the kick drum, particularly when dealing with high tempo tracks. A 240 bpm track, for example, matches the beat of a 120 bpm track without slowing down or speeding up, because both have an underlying tempo of 120 quarter notes per minute. Thus, some soul music (around 75–90 bpm) mixes well with a drum and bass beat (from 150 to 185 bpm). When speeding up or slowing down a record on a turntable, the pitch and tempo of a track are linked: spinning a disc 10% faster makes both pitch and tempo 10% higher. Software processing to change the pitch without changing the tempo is called pitch-shifting. The opposite operation, changing the tempo without changing the pitch, is called time-stretching. See also A capriccio Alla breve As Slow as Possible Bell pattern Half-time (music) Multitemporal music Stop-time Citations General sources Books on tempo in music: Snoman, Rick (2009). The Dance Music Manual: Tools, Toys, and Techniques – Second Edition. Oxford, UK: Elsevier Press. . Music dictionaries: Apel, Willi, ed., Harvard Dictionary of Music, Second Edition, Revised and Enlarged. The Belknap Press of Harvard University Press, Cambridge, Massachusetts, 1969. Sadie, Stanley; John Tyrrell, eds. (2001). The New Grove Dictionary of Music and Musicians, 2nd edition. New York: Grove's Dictionaries. . Examples of musical scores: External links Tempo Terminology, Virginia Tech department of music Tempo variation among and within 300+ recorded performances of Beethoven's 'Eroica' Symphony Dolmetsch article on tempo Musical terminology Rhythm and meter Temporal rates