![\"\"](\"https:\/\/robertvierschilling.com\/wp-content\/uploads\/2023\/02\/Open-Music-Theory-Cover.png\")
\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\tOpen Music Theory Version 2<\/strong> (https:\/\/viva.pressbooks.pub\/openmusictheory\/<\/a>) and Music Theory for the 21st<\/sup>-Century Classroom <\/strong>(https:\/\/musictheory.pugetsound.edu\/mt21c\/MusicTheory.html<\/a>) are free online music theory textbooks that focus on topics typically covered in undergraduate music theory courses. Both sites are easy to navigate and have excellent content. I refer students to both websites when teaching classical guitar and composing for classical guitar. If a topic in music theory comes up in a lesson about which a student has questions, I can explain the topic in the lesson, and then refer the student to the appropriate pages on one of the two free online textbooks for additional explanation.<\/p> I generally refer students to pages on both websites that are about music fundamentals, harmony, or form. Both websites have many more pages than I have used in lessons. I use both websites as supplemental resources, and I have not led students through either text section by section or used them as primary texts in lessons or for teaching a class. However, when I give students handouts that I make using music notation software along with my in-person explanations (or over-Zoom\/over-Skype explanations), they have enough understanding to go pages to which I refer them and benefit from the supplemental reading.<\/p><\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/section>\n\t\t\t\t![\"\"](\"https:\/\/robertvierschilling.com\/wp-content\/uploads\/2023\/02\/Music-Theory-21-Century-Cover.png\")
\t\t\t\t\t\t\t\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t<\/div>\n\t\t\t\t\t\t<\/div>\n\t\t\t\t\t<\/div>\n\t\t<\/div>\n\t\t\t\t