Galt MacDermot was a Canadian-American composer and pianist best known for his groundbreaking work in musical theater. His most celebrated achievement remains the score for the 1967 rock musical Hair, which revolutionized the genre by integrating rock and roll with traditional Broadway structures. MacDermot's compositions, including the enduringly popular Good Morning Starshine and Let the Sunshine In, became cultural touchstones of the late 1960s counterculture. Beyond his theatrical success, he maintained a prolific career in film scoring and television, contributing to a diverse body of work that spanned decades. His ability to blend accessible melodies with complex orchestration helped define the sound of an era, leaving a lasting legacy in both stage and screen music.