Strohbass & Kehlgesang
Undertone singing refers to singing techniques that produce pitches below the modal voice. They extend the voice ambitus by one octave or more to downwards.
There are two fundamentally different vocal techniques for undertone singing:
Strohbass vs. throat singing, comparison of both undertone singing techniques by means of video endoscopy of Wolfgang Saus’ voice. Video: Dr. med. Andreas Seimer, Phoniatrics at the Marienhospital Stuttgart, during the Stuttgarter Stimmtage 2006.