Moondog, born Louis Thomas Hardin (May 26, 1916 – September 8, 1999), was a blind American composer, musician, poet and inventor of several musical instruments. Moving to New York as a young man, Moondog made a deliberate decision to make his home on the streets there, where he spent approximately twenty of the thirty years he lived in the city. Most days he could be found in his chosen part of town wearing clothes he had created based on his own interpretation of the Norse god Odin. Thanks to his unconventional outfits and lifestyle, he was known for much of his life as "The Viking of 6th Avenue".

Moondog's music took its inspiration from street sounds, such as the subway or a foghorn. It tended to be relatively simple but characterized by what he called "snaketime" and described as "a slithery rhythm, in times that are not ordinary.

In a search for new sounds, Moondog also invented several musical instruments, including a small triangular-shaped harp known as the "Oo", another which he named the "Ooo-ya-tsu", and (perhaps his best known) the "Trimba", a triangular percussion instrument that the composer invented in the late 40s. The original Trimba is still played today by Moondog's friend Stefan Lakatos, a Swedish percussionist, to whom Moondog also explained the methods for building such an instrument.