Curated OER
Ear Training - 7th chords
In this ear training worksheet, students listen to each measure containing the bottom note of the triad they hear played and write the correct notes that are missing and construct the requested chords on the this sheet music worksheet.
Other
University of Vermont: The String Pedagogy Notebook
A great resource for teachers, students, and performers of string instruments. Very indepth "how-to" descriptions, care information, procedural movies, and more.