D'Addario is a manufacturer of musical instrument strings, primarily guitar strings, currently headquartered in Farmingdale, Long Island, New York.
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Originally located in Lynbrook, New York, the business continued to expand and in 1994 moved to its current facility in Farmingdale, New York.
He is based on Baltimore Police Department Shift Lieutenant Gary D'Addario, a member of the BPD homicide unit described in David Simon's book Homicide: A Year on the Killing Streets which served as the inspiration for the series as a whole.
Since then, Schugar received endorsement deals with Daisy Rock Guitars, Floyd Rose Tremolo Systems, D'Addario Strings, Crate Amplifiers, Seymour Duncan, Fernandes Sustainers and Robert Keeley Electronics, and is written about in music trade magazines and internet webzines.
D'Addario is best known as the shift commander featured in David Simon's Homicide: A Year on the Killing Streets book and was the inspiration for the character of Al Giardello seen on NBC's Homicide: Life on the Street.
Halsey is the co-creator of the Billboard/Starmaker Worldwide Song Contest which is entering its 19th year, and is co-sponsored by Sonicbids, Disc Makers, Casio, GoGirlsMusic.com, D'Addario Strings, TAXI, Indie Band Manager and BluBlocker Sunglasses.