Louis Thomas Hardin (May 26, 1916 - September 8, 1999), also known as Moondog, was an American musician, composer, theoretician, poet and inventor of several musical instruments. He was blind from the age of 16. Hardin lived in New York from the late 1940s until 1972, and during this time he could often be found on 6th Avenue, between 52nd and 55th Streets, wearing a cloak and a horned helmet sometimes busking or selling music, but often just standing silently on the sidewalk. He was widely recognized as "the Viking of 6th Avenue" by thousands of passersby and residents who weren't aware of his musical career.

From the late 1940s until 1972, Moondog lived as a street musician and poet in New York City, playing in midtown Manhattan, eventually settling on the corner of 53rd or 54th Street and 6th Avenue in Manhattan. He was not homeless, however, or at least not often: he maintained an apartment in upper Manhattan and had a country retreat in Candor, NY, to which he moved in 1972. He partially supported himself by selling copies of his poetry and his musical philosophy. In addition to his music and poetry, he was also known for the distinctive fanciful "Viking" cloak that he wore. Already bearded and long-haired, he added a Viking-style horned helmet to avoid the occasional comparisons of his appearance with that of Christ or a monk, as he had rejected Christianity in his late teens. He developed a lifelong interest in Nordic mythology, and maintained an altar to Thor in his country home in Candor.  In 1949 he traveled to a Blackfoot Sun Dance in Idaho where he performed on percussion and flute, returning to the Native American music he first came in contact with as a child. It was this Native music, along with contemporary jazz and classical, mixed with the ambient sounds from his environment (city traffic, ocean waves, babies crying, etc.) that created the foundation of Moondog's music.  In 1954, he won a case in the New York State Supreme Court against disc jockey Alan Freed, who had branded his radio show, "The Moondog Rock and Roll Matinee", around the name "Moondog", using "Moondog's Symphony" (the first record that Moondog ever cut) as his "calling card". Moondog believed he would not have won the case had it not been for the help of musicians such as Benny Goodman and Arturo Toscanini, who testified that he was a serious composer. Freed had to apologize and stop using the nickname "Moondog" on air, on the basis that Hardin was known by the name long before Freed began using it.

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