Covers

Sure, we'd love to hear John Mayer cover his ex Katy Perry's 'Dark Horse' or 'Unconditionally.' But that's not likely to happen, so we'll "settle" for being blown away by his acoustic cover of Beyonce's 'XO.'

Pop stars covering other pop stars' songs is not a new convention, especially in the digital, plugged-in age. But when Demi Lovato tackles an Ed Sheeran song, it's an event. Lovato blew the roof off with her version of Sheeran's gorgeous '+' track 'Give Me Love.' Like wow. Seriously.

Carly Rose Sonenclar -- remember her? The little girl with a big voice who was the runner up on Season 2 of 'The X Factor' while working with Britney Spears, has partnered with one of the members of Internet powerhouse Boyce Avenue for a totally amazeballs mashup. They took the Eminem x Rihanna smash 'The Monster' and cross-pollinated it with OneRepublic's hit 'Counting Stars.'

Pharrell's upbeat tune 'Happy' is everywhere -- it's on a constant loop on the radio, in the film 'Despicable Me 2' and was even nominated for an Academy Award. But you've never heard the song like this before!

With Fifth Harmony and Little Mix joining Demi Lovato on the road, the Neon Lights Tour already runs via girl power. But when 5H throw a sisters-doing-it-for-themselves anthem by a legendary female group into their support set? Throw your hands up!

It's not yet Valentine's Day, but "Valentime's Day" has already arrived, courtesy of the guys of Timeflies!

Miley Cyrus' cover of Arctic Monkeys' 'Why'd You Only Call Me When You're High' has leaked online.

It's a special edition of Timeflies Tuesday -- just in time for Super Bowl Sunday!

British singer Birdy, who is all of 17, delivered a totally unforgettable cover of Bon Iver's 'Skinny Love,' which lives on her 'Breathe' EP, in 2011. It's achingly and crushingly beautiful, and now we can't stop watching this new version of the video for the U.S.

Timeflies weren't going to let the impending release of their new single next week keep them from attending to their "Timeflies Tuesdays" duties!