What. a. tune.
Whether you love her, hate her, or just don’t really care, there is no denying the phenomenal global talent that is Beyonce Knowles.
She has incredibly vocal ability, robustness, and performance skills that are rare to say the least.
In this particular song she introduces some RIDICULOUS riffs and some nigh-on-impossible key changes. That said, I cover this sort of material with a number of singers and really help a number of people work towards making these sorts of riffs not just achievable, but a standard part of their repertoire.
Check it out, particularly the last 1m30s.