My Masterpiece is my Sing & Strum: Ukulele for the Elementary Music Classroom. It's my first go at a growing bundle and my largest, most comprehensive resource to date. Even as I sat sketching it out, I couldn't imagine the twists and turns it was going to take before it was (almost) done.
To purchase Sing & Strum, check out my store on TeachersPayTeachers!
You might also like my Sing & Strum Sampler to see how the resource is organized. (It's free!)