Jackie Jackson, born Sigmund Esco Jackson, is an American singer and musician renowned as an original member of the Jackson 5, a popular Motown group of the late 1960s and early 1970s. His rhythmic, soulful style, harmonizing with his brothers, significantly contributed to the group's signature sound, characterized by Motown R&B fused with pop. Jackson's work with the Jackson 5, particularly hits like "I Want You Back" and "ABC", has had a profound influence on the development of pop music. Despite being less in the limelight than his younger brother, Michael, Jackie Jackson's contributions to the group have been integral to their success and legacy.