B. Zvacek is a contemporary American jazz arranger and composer, recognized for their innovative contributions to modern big band music. Emerging in the late 20th and early 21st centuries, Zvacek's style blends intricate harmonic language with vibrant rhythmic complexity, often incorporating elements of post-bop and contemporary classical music. Their arrangements, lauded for their sophisticated voicings and challenging yet rewarding instrumental passages, have been featured by numerous collegiate and professional jazz ensembles. Zvacek's work has significantly expanded the repertoire for large jazz ensembles, pushing the boundaries of traditional big band sound with a fresh and distinctive voice.