There are at least two artists by this name.  1) Margaret is an Estonian singer, who is collaborating with Karel Kattai in a project called Margaret. Karel does the production and Margaret sings   2) Margaret was the only name listed for a Native American schoolgirl who recorded a song for the Library of Congress series of field recordings.  3) Margaret is an upcoming Polish singer (b. 1991), who in February 2013 released her first single “Thank You Very Much”. Her full name is Małgorzata Jamroży.