Maven of melancholy Norah Jones' subtly quirky side bubbles up in the big-band exhilaration of "Everybody Needs a Best Friend" and in a timeless May-December duet with Willie Nelson, "Baby It's Cold Outside." But she's recorded few songs more resonant than "Traces of You," a cathartic guitar-meets-sitar tribute—with her half-sister Anoushka Shankar—to Ravi Shankar, their father.