Doo wop-inspired adult contemporary R&B group All-4-One enjoyed platinum-selling, Grammy-winning success with their earliest releases. While the vocalists' popularity was not sustained during the late '90s, they continued to record and perform for over 20 years. The Los Angeles-based quartet -- Tony Borowiak, Jamie Jones, Delious Kennedy, and Alfred Nevarez -- formed in 1993 and debuted the next year with an a cappella cover of "So Much in Love," a song popularized 30 years earlier by the Tymes. It reached number five on the Billboard Hot 100 and was trumped by the follow-up "I Swear." Another cover, this one relatively contemporary -- John Michael Montgomery's version was released only a few months earlier -- it topped the Hot 100 and went platinum. Due to these hits, the group's self-titled debut album, split almost evenly between ballads and relatively uptempo post-new jack swing R&B, went multi-platinum.