Best Online Guitar Classes from Kolkata, India at the NSM The Northern School of Music excels as one of the best online guitar classes from Kolkata providing training in several musical genres like Western Classical & Contemporary Music, Rock n Roll, Country, Folk, Pop, Funk, Latin, Blues, etc. Dedicated to augmenting the knowledge and skill of the students, the NSM promises to deliver the best online guitar classes. Associated with some of the finest online guitar teachers, we strive to facilitate students with a top-notch guitar learning experience. The NSM recommends certification from the Trinity College London or ABRSM, though it is not mandatory.