Hemiola

A hemiola (from the Greek 'hemiolios', meaning 'one and a half') is a rhythmic device where two groups of three beats are reinterpreted as three groups of two, or vice versa, creating a momentary metric shift that adds tension and forward motion. It is one of the oldest rhythmic tricks in Western music, common in Renaissance dance music, Baroque sarabandes, Brahms waltzes, and Latin American styles like the bossa nova. In piano music you will encounter hemiolas most often in triple-time pieces (3/4 or 6/8) where the composer suddenly implies duple metre across bar lines. To play a hemiola convincingly, feel the larger grouping physically — shift your bodily pulse from 'ONE-two-three ONE-two-three' to 'ONE-two ONE-two ONE-two' and let the new accent pattern emerge naturally.