This document discusses musical form and outlines the main vocal and instrumental forms. It notes that form is the structure and combination of all musical elements. There are two main forms - vocal, which includes opera, cantata, and oratorio that feature singing and stories, and instrumental, which includes sonata, concerto, and symphony that are designed for instruments, often solo instruments with orchestra accompaniment. The vocal forms vary in length and use of staging, while the instrumental forms are structured similarly and composed for different instrument and ensemble combinations.