"Back at One" is a romantic R&B song by Brian McKnight, released in 1999. The song expresses deep feelings of love and the desire to rekindle a relationship. Its smooth melody and heartfelt lyrics emphasize the importance of starting over and cherishing moments together. The track became one of McKnight's most popular hits, showcasing his vocal range and songwriting skills. It reached high positions on various music charts and has been featured in numerous films and television shows, solidifying its status as a classic love song in the R&B genre.