The Art of Online Piano Pedagogy. After most of the music pros were thrown into online teaching during the 2020 COVID-19 pandemic, Ratko Delorko, performing and recording pianist (currently lecturing at Frankfurt Music University, former Mozarteum Salzburg) found plenty of good reasons to not go back totally to in-person lessons. Find all dos and don'ts here and find out how he enhanced the online learning experience with innovative technology.