Do you know music by Gioseffo Zarlino, Johann Mattheson, or Heinrich Schenker? Thanks to my dear students and their widespread interests, I felt inclined to go beyond the well-known treatises and textbooks of European music scholarship, and to dig a bit deeper to see what those scholars contributed in the domain of musical composition. The playlist Music by Theorists is, if you will, the side effect of a seminar on the history of music theory which I had the pleasure to give at Robert Schumann Hochschule Düsseldorf. I believe that many of these pieces are worth being disclosed from obscurity—and, of course, there is still much more to discover. For now I hope you enjoy this selection of preciosities as much as I did.