Her first album wasn't even that successful though. Vincent got lucky by making Lady Gaga famous. He's not that great aside from mentoring Lady Gaga.
And Tamar's career will never "end" because it never really started. She'll continue to make great music though since she has the talent to do so. Plus Tamar is like 20x richer than K Michelle so she wins.
Beyonce can shake her ass/hair and sell out a tour, but she has no artistic vision and cannot write a song. She is not Madonna. She's more of a Tina Turner.
This.
Madonna = Madonna
Whitney = Whitney
Mariah = Mariah
Janet = Britney
Beyonce = Tina
gaga = cyndi lauper
Kesha = Paula adbul
Adele = Celine
Xtina = the girls in the 80s and 90s that tried to be whitney or mariah but can't be remembered outside of 2-3 hits
Don't do talent like that. 
