Humans can hear 20 to 20,000 Hz, so why do we only have 8 repeating notes (which only go up to 2,000 Hz) when we could make more interesting music? - Quora
The 13 weirdest musical instruments ever - Classic FM
Howard Massey, Author at Yamaha Music
Octobass - Etsy
The Musical Instrument Museum: Travel the World through Sound without Leaving Phoenix -
Celebrating the Metro and The OSM's New Octobass (Review) - my/maSCENA