Christina Perri In July 2010, a struggling singer-songwriter and musician named Christina Perri had a life-changing moment when she was asked to perform a song she had written, a defiant break-up anthem called “Jar of Hearts,” on the Fox show So You Think You Can Dance. The raw, emotional quality of her performance connected with viewers and catapulted the 24-year-old Philadelphia native. About Coldplay British band who came to prominence…