University Physics Volume 1Moebs, W., Ling, S.J., & Sanny, J. (2016). University physics volume 1. OpenStax. CC BY 4.0 . Access for free at https://openstax.org/books/university-physics-volume-1/pages/1-introduction
For Lesson 1, read "Chapter 15: Oscillations" and "Chapter 16: Waves." Additionally, read sections 17.1, 17.2, 17.3, 17.6, and 17.7 from "Chapter 17: Sound."