And another thing...though "the 80s-90s Trinity" is great, if you compare them to the TRUE TRINITY which would be Aretha, Barbra and Ella Fitzgerald, they fail in comparison: http://www.youtube.com/watch?v=6GJSS2IfEGg These are three most influential female vocalists in modern day mainstream(pop) entertainment history. Pretty much every female vocalist is influenced mostly by these three female vocalists.

So let's not pump MC, Whitney and Celine too much now. Debating whether Beyoncé belongs in the "The 80s-90s Trinity" is moot because she's not of that generation in the first place. She's the Next Generation and if you going to have a Trinity from that generation, then an 8 time Vocal Performance Grammy Winner is going to definately be part of that discussion.