An enterprising chanteuse whose songs invite you to sing and snap along, this French singer/songwriter is a case study in 21st-century career-building. She parlayed viral MySpace demos into a platinum debut album, Gossip Girl soundtrack placements, and appearances on the French version of Dancing with the Stars. Her appeal is easy to understand: Jonathan's comforting coo and snap-happy, piano-rolled folk-pop serenades radiate feel-good vibes and break-of-day optimism. But the polished presentation never overpowers her humble, earthy essence.