Of all the things to be clueless about, these 90s album covers aren't one of them. Discover which of your favorites (if any) ...

In honor of one of music's most timeless eras, here's a list of 25 of the greatest R&B songs of the '90s.

The '90s saw the continued rise of powerhouse vocal groups in R&B music.

Xbox has collaborated with '90s R&B group All-4-One to create a music video about Xbox All Access.

Among the 30 or so contemporary artists whose work informed this story, the average song is just over three minutes, a full minute shorter than R&B songs from a comparable list of 1990s artists.