From Longman Dictionary of Contemporary Englishbandleaderband‧lead‧er /ˈbændˌliːdə $ -ər/ noun [countable] someone who conducts a band, especially a dance or jazz band
Examples from the Corpus
bandleader• Whether as a bandleader or a creative supporting player, Blade's contribution is tremendously assured.• As a bandleader, Basie was low-key and hang-loose but the band itself was incredibly tight.• As a bandleader, songwriter, and talent scout, Otis was a real force in the Los Angeles scene.• She was chief dancer and choreographer, he was bandleader and strategy-maker. 