Horst graduated in 1986 from the state Academy of Music and Performing Arts (Staatliche Hochschule für Musik und Darstellende Kunst) in Graz, Austria, summa cum laude.
Horst graduated in 1986 from the state Academy of Music and Performing Arts (Staatliche Hochschule für Musik und Darstellende Kunst) in Graz, Austria, with highest honors.