I am very pleased to share with you a short online course on the notation of Gregorian Chant (in English) led by Luca Buzzavi, professor of Gregorian Chant at the Pontificio di Musica Sacra in Rome. This course is being offered by the Academy of Sacred Music Francesco Azopardi (Malta) with the collaboration of the Pastoral Formation Institute (Malta) and AERCO Academy (Italy). More information about this course may be found here:

https://asm.mt/study/courses/intro-gregorian-chant-notation/