Frontiers of sound The echo hunter Culture Human interest Environment ... Print comment Embed code Copy and paste the embed code above. This content was published on September 4, 2016 10:00 AMSep 4, 2016 - 10:00 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) Neuer Inhalt Horizontal Line subscription form Form for signing up for free newsletter. Sign up for our free newsletters and get the top stories delivered to your inbox. Email address Top stories (weekly) Latest news (daily) Business (weekly) Politics (weekly) Society (weekly) Fintech (monthly) Click here to see more newsletters swissinfo EN The following content is sourced from external partners. We cannot guarantee that it is suitable for the visually or hearing impaired. swissinfo.ch Join us on Facebook!