How many Sound Waves books are there?

There are 2 books in the Sound Waves series by Daniel Nunn, for ages 6-8.

Sound Waves Books in Order — Wonderlit

Sound Waves is a 2-book series for ages 6–8 by Daniel Nunn. Each book stands alone — start anywhere.

Start anywhere — each book stands alone.

That said, Voices and Strings are great first picks.

No particular order needed — browse and pick what catches your eye.