Ocean Stegosaurus Tardigrade, formerly known as Mark Allan Barnes, is a British microtonal composer, performer and instrument maker. He builds mostly experimental plucked string instruments (e.g. guitars) tuned in various edos and JI tunings.
His former YouTube channel, MarkAllanBarnes, was active from 2009 to 2014. His new channel, Ocean Tardigrade, was created in 2011 and is still active as of 2021.