Since its founding in 1998, the quartet’s individual style reflects the influences of collaborating with outstanding pedagogues and ensembles such as the Amadeus Quartet and La Salle Quartet. The four musicians embarked on an international career early on. Many of the quartet’s concerts have been recorded, which is confirmed by its extensive discography. Particularly noteworthy is a recording of the complete Schubert string quartets on the Brilliant Classics Label in 2017, which was highly praised by critics. The quartet owes its name to a long-standing friendship with the late Rudolph C. Bettschart, co-owner of the Swiss publishing house Diogenes, who died in 2015. 
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 Stefan Kirpal, Violine Gundula Kirpal, Violine Alba González i Becerra, Viola Stephen Ristau, Violoncello