Amogh Symphony Drummer/Mastering Engineer + Jim Richman puts up short drum lessons.
Watch on YT: https://youtu.be/NldSvyQj_xM and https://youtu.be/dIINnxxDzFE
Amogh Symphony Multi-Instrumentalist/Producer Andrey Sazonov puts up short informative video on use of tapping, tuning and Guqin tuning on guitar for various styles.
Watch on YT: https://www.youtube.com/watch?v=b-8TOHmhhU4, https://www.youtube.com/watch?v=riZAL929kkg and https://www.youtube.com/watch?v=a8w5XxFIKYY