The five Jackson brothers' interest in music took place in Gary, Indiana, bolstered by their father Joe Jackson. In 1964, Joe caught son Tito playing with his guitar after a string broke. Upon fixing the string, threatening punishment, Tito's father had him play and was impressed enough to buy the boy his own guitar. Tito, Jermaine and Jackie showed an interest in singing and formed their own group with their father naming them as The Jackson Brothers, with six-year-old Michael playing congas and childhood buddies Reynaud Jones and Milford Hite playing keyboards and drums. Marlon, then seven years old, eventually joined playing the tambourine. In August 1965, before a show at Gary's Tiny Tots Jamboree held on Michael's seventh birthday, Evelyn LaHaie suggested the group rename themselves to The Jackson Five Singing Group, later shortened to simply The Jackson Five.

http://en.m.wikipedia.org/wiki/The_Jackson_5