Final answer:
The most important duties of being the band leader include providing direction and guidance to band members, making decisions about music selection, and acting as a liaison between the band and external parties.
Step-by-step explanation:
The most important duties of being the band leader involve providing direction and guidance to the other band members. The band leader is responsible for setting the tempo, cues, and dynamics during performances. They also make decisions regarding the repertoire, selecting and arranging music for the band to perform. Additionally, the band leader acts as a liaison between the band and any outside parties, such as event organizers or managers.