The Octobass.
“The octobass is a giant, 4m-high double-bass; the lowest note it can sound is 16Hz, below the hearing threshold for the human ear.”
http://magazine.amati.com/152-news/news-new-octobass-takes-stage-oslo.html
The Octobass.
Published
Music for elephants.
Shaun Griffith much more for Dolphins I guess
Berly Tannyono Putra I would think dolphins prefer a higher register. Perhaps you are thinking of whales?