Martha Harvin, known professionally as Martha High, is an American singer-songwriter. High began her career in the early 1960s as a member of the female vocal group The Jewels. After a string of unsuccessful singles, the group released their only charting single "Opportunity" to minor success. The Jewels eventually became the background vocalist of James Brown in 1964 and continued to tour with him until they disbanded in 1968. High continued on performing as a background singer for Brown.