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Glasper, also known as Kam Parker, insists he was a "young, inexperienced college student" trying to break into the music industry when he agreed to the contract with publishing company owner Bethel Harris.
He alleges Harris "exploited" his talents and claimed to be "the only person that Usher Raymond's representatives would negotiate with for the song Monster".
Legendary Poets closed its doors in February 2010, before relaunching that summer (10) - and Glasper argues his contract should be dissolved too.
He recently filed the civil complaint in DeKalb Superior Court in Georgia and is seeking to take back full ownership of his songs, in addition to compensation and legal costs, reports YoRaps.com.