Among other virtues, Justin Timberlake's first new single in six years is utilitarian: a gift to the world's wedding DJs. It's a 21st century "Puttin' on the Ritz," an ode to dressing to the nines and going dancing that will be soundtracking nuptials, proms, and other formal-wear occasions for the foreseeable future. It sounds the part. Co-produced by Timberlake's longtime maestro Timbaland, "Suit & Tie" is natty – as expertly tailored and crisply pressed as a high-end tux. It opens with a fake-out – Timberlake drawling "I be on my suit and tie shit," over a woozy, downtempo synths – before segueing into the song-proper: an airy, swinging groove, with tinkling harps, finger-snap percussion, and tooting brass. There are traces of R. Kelly's Chicago-stepping songs, Robin Thicke's neo-Seventies soul, and, of course, the beatific Michael Jackson of "Rock with You." But there's no mistaking the JT touch – the confident suavity, and a falsetto as plush and pliable as anyone's. Jay-Z's rap sounds phoned-in, but he drops a bunch of fashion brand names (Tom Ford, All Saints, Alexander Wang) and that does the trick.

“Help Me”

Joni Mitchell wrote and recorded this song for her album Court and Spark, but she had to switch from her regular band to make the song sound exactly the way she wanted. "I had attempted to play my music with rock & roll players," she told Rolling Stone. "They’d laugh, 'Awww, isn't that cute? She's trying to teach us how to play.'" Mitchell switched to a jazz band, Tom Scott’s L.A. Express, and scored the biggest hit of her career in the process.