Stefan Keller

Music
Zürich
Noten für Notenpunkt!
by Notenpunkt

Exhibition and Music
Zürich
waVox vintage sounds
by waVox vintage sounds

Music, Kids / Youth, and Education
Zürich and Biel/Bienne
Fingerflink
by Anna-Barbara Rösch

Music and Art
Aarau
ContempArabic Jazz Ensemble – Tour 2014
by Stephan Athanas