In 1888 he habilitated[1] and accepted a position at the University of Zurich for musicology and taught there as a lecturer at the faculty of philosophy until 1894.
[2] After that he lived in England for study purposes until 1896 and after his return to Germany he worked as a music writer in Cleve [de].
at the Akademie für Tonkunst [de] there he gave piano lessons and directed the Academic Singing Association.
Nagel became known among other things through his co-authorship of the three-volume work General History of Music by Richard Batka.
His nationalist-reactionary attitude[3] and his aesthetic politicization of the term Worldview[4] as a journalist is evident, among other things, in his position on the Pfitzner-Bekker controversy[5] to "musical impotence" and in articles like Der Futurismus – eine undeutsche Erscheinung,[6] in which he resorts to polemical expressions such as "mindless ridiculousness" and turns against the composers of New Music - among others Ferruccio Busoni, Arnold Schoenberg, Josef Matthias Hauer.