The term "companion band" refers to a musical group that performs alongside a headlining act, often serving as an opening act or providing backing/support for the main attraction. Synonyms for companion band include support band, opening act, warm-up band, backup band, secondary band, accompaniment band, and feature band. These terms all describe bands that add depth and variety to a concert, allowing audiences to experience multiple styles of music in one event. Whether you call them feature bands or support acts, companion bands play an important role in the music industry, both for emerging artists looking to gain exposure, and for established performers seeking to diversify and enhance their shows.