Chopin's Mazurka in B-flat Minor, Op. 24, No. 4 is based on a heroic folk dance from __________. With its __________ meter and accents on the second or third beat, the dance provided a platform for Chopin's artistry. The melody is wide-ranging and often __________, and Chopin makes use of modal harmonies, while the performer employs __________ for expressive purposes.