Guitar Center is the largest chain of musical instrument retailers in the world with 262 locations throughout the United States. Its headquarters is in Westlake Village, California.Guitar Center's sister companies/subsidiaries incorporate Music & Arts, Musician's Friend, GuitarCenter.com, LMI, Giardinelli, Musician.com, Private Reserve Guitars, Woodwind and Brasswind, Music 123, and Harmony Central.There has also been a T.V.