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Jazz cover refers to jazz reinterpretations of songs that did not originally belong to the jazz canon (e.g., pop, rock, R&B), as well as fresh, personalized arrangements of well‑known standards. Its hallmark is transformation: arrangers and improvisers reharmonize chord progressions, alter groove and meter (swing, bossa nova, funk, odd time signatures), reshape melodies through phrasing and ornamentation, and open the form for solos. The result keeps the recognizable core of the source tune while reframing it with jazz harmony, rhythm, timbre, and improvisational language. Historically, the practice grows out of jazz musicians’ long tradition of adapting Tin Pan Alley and Broadway songs. From the 1960s onward, covering contemporary pop/rock and later hip‑hop and electronic music became common, creating a fluid bridge between mainstream repertoire and jazz aesthetics.