The word of the day is étude:

étude,  (French: “study”) in music, originally a study or technical exercise, later a complete and musically intelligible composition exploring a particular technical problem in an esthetically satisfying manner. (Encyclopedia Britannica)


"Early recordings of Jay-Z reveal a nimble but mild-mannered virtuoso, delivering rat-a-tat syllables (he liked to rap in double-time triplets, delivering six syllables per beat) that often amounted to études rather than songs."

 - Kelefa Sanneh, "Word: Jay-Z's 'Decoded' and the language of hip-hop", 6 December 2010 The New Yorker