IPA: /ˈsɔːŋbʊk/
KK: /sɔŋbʊk/
A book that has a collection of songs, often including the lyrics and music notes.
She brought her songbook to the campfire to sing along with her friends.
Songbook → It is formed from "song" (from Old English *sang*, meaning a piece of music with words) and "book" (from Old English *bōc*, meaning a written work or collection). A songbook is a collection of written songs.
Think of a 'piece of music with words' ('song') collected in a 'written work' ('book') — that's what a songbook is.