What does 2 of mean in music?

The term "2 of" in music refers to the second part of a two-part composition or the second repetition of a musical phrase or passage. It is often used in classical music, jazz, and other musical genres where pieces are divided into sections or movements.

For example, in a sonata, the first movement may be marked as "Allegro" (fast and lively), while the second movement could be marked as "Andante" (slow and graceful). In this case, "2 of" would be used to refer to the second movement of the sonata.