Sydney.Black18 has 1 All-4-One concert.

All-4-One is a male soul and rnb group, best known for their hit single "I Swear" from their self-titled 1994 debut album. "I Swear," a remake of the country hit from John Michael Montgomery, won the 1995 Grammy Award for Best Pop Performance By A Duo Or Group With Vocal and enjoyed an eleven-week run at #1 on the Billboard Hot 100 as well as a seven-week run at #2 in the U.K. Praised for their four-part harmonies and smooth sound, they had their most success in the 90s.