She's an inderrated musician for sure. Not by the industry, they know just how good she is, but by the GP. Her musicality is at a 10 now. She's evolved so much, though she's always had a great ear.
The Resentment performances during OTR put her above Mariah for me (but only live, in the studio Mariah displays more creativity than Bey does on her recordings). Maybe the bar is just higher for Mariah, but i've never heard Mariah re-interpret her own songs like Bey did during Resentment, 1+1 and Why Don't You Love Me. At least, not in the way that made the song better for me. And Bey did that stuff on the spot. Every night was different and every night the melody and arrangement became more beautiful and more powerful.
On the Mrs Carter Show she was scatting during Crazy in Love. Her scatts were so precise and it sounded like they've always been a part of the song. I catch myself actually singing them whenever i'm listening to the original song. Now I kinda wish they were a part of the song.
What Beyoncé also does during a lot of her live shows is become her own hype man. Like she did during the Me Myself and I performance in the OP. "Now on, NOW ON! Heeeeeeey". I love that.
Beyoncé just gets it. She's an incredible musician.
The OTR Resentment performances, man.. They kill me.