The echo hunter
Christian Zehnder is an established musician. Besides singing in operas, writing music for the theatre, and giving singing lessons, he records the sound of echoes in the Alps. (SRF, swissinfo.ch)
Christian Zehnder is an established musician. Besides singing in operas, writing music for the theatre, and giving singing lessons, he records the sound of echoes in the Alps. (SRF, swissinfo.ch)
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