Brad Mehldau has expanded the language of acoustic jazz, but the pianist also punches right through it. He reimagines Dylan's “Don't Think Twice It's Alright” as Americana chamber music alongside Chris Thile's graceful mandolin, and his version of the grunge hit “Smells Like Teen Spirit” showcases his athletic classical chops. His fusion number “Hungry Ghost” drops electric piano runs and synth warbles onto funky percussion.