Music 1 Theory book recs? (1 Viewer)

[Epicman69]

Hey guys my sister is looking to do Music 1 for her hsc and I just wanted to ask for any Theory book recommendations, she is solid on the performance part but not so much on the theory side. Thank in advance!

 

[Anaya R]

Use "An Introduction to Concepts in Music" by Nick Peterson.
Even as a Music 2 student I found it quite helpful