When studying music, skills are often practiced with a teacher, face-to-face, in a classroom. What are the experiences of classroom teacher trainees when music teaching becomes asynchronous, i.e., an individually completed online course? This question, among other things, was explored at a Finnish University's Teacher Education Department in autumn 2020, resulting in the production of a two-credit online music course on the Moodle learning environment. It was implemented for the first time during the summer term in 2021. We analyzed the students' experiences with the functionality of the e-learning module through data-driven content analysis. The study represents an intensive case study using students' (n=6) learning diaries as data.