I Am... Sasha Fierce

From the first set, “If I Were a Boy” and “Disappear” are acoustic downtempo tunes. On the opposite end, her larger-than-life voice is perfectly suited to the sonic enormity and melodrama of “Halo.” Beyoncé is one of the few performers who can swiftly shift from a song like “Ave Maria” to the booty-shaking uproar of “Single Ladies (Put A Ring On It).” And her sass and swagger matches the fearsome throb of “Diva.