Related Information for Mary Margaret O'hara Mary Margaret O'Hara is a Canadian singer-songwriter and actress, who has been hailed as one of the greatest cult heroines in rock music despite having released very few of her own recordings. She is the sister of comedic actress Catherine O'Hara. Her music ranges from gentle, countrified pop to avant-garde tone poems. Her recorded output has been extremely limited - in addition to her full length album "Miss America", she released a "Christmas" EP in 1992, and cont.. read more