This document defines key musical terms like musical instrument, musician, composer, lead singer, songwriter, band, conductor, orchestra, and solo artist. It explains that a musical instrument is used for playing music, a musician plays an instrument, a composer writes music, the lead singer is the main vocalist in a band, a songwriter writes words and music for songs, a band is a group that plays music together, a conductor directs an orchestra, an orchestra is a large group of musicians, and a solo artist performs alone rather than in a band.