Pretty good list for the most part, some of the songs selected for the artist are a bit questionable.
Obvious omissions from the list:
"Tell Me" - Groove Theory
"I Get Lonely" - Janet
"No, No, No" - DC
"Doo Wop (That Thing)" - Lauryn Hill
"Weak" - SWV
"Who Can I Run To" - Xscape
I just noticed the Toni snub.
She practically was the purest Contemp/R&B act of the 90s.
And when did "The Crossroads" become an R&B song?