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3.2.1 Music expressions explained

Analogy: mathematical expressions
Simultaneous music expressions: multiple staves
Simultaneous music expressions: single-staff

In LilyPond input files, music is represented by music expressions. A single note is a music expression:

a'4

Enclosing music in braces creates a compound music expression. Here we have created a compound music expression with two notes:

\relative { a'4 g4 }

Putting a group of music expressions (e.g., notes) in braces means that they are in sequence (i.e., each one follows the previous one). The result is another music expression:

\relative { { a'4 g } f4 g }