More than 1,000 people gathered at New York City's Hammerstein Ballroom on Wednesday to celebrate a good cause. Among them were also A Great Big World, Ryan Star, Mary Lambert, DJ Hannah Bronfman and famous DJ Cassidy.
Christina Aguilera posted a picture on Twitter Tuesday that teased about her new music. "Working on something special...Happy Holidays to all!!" The Voice coach captioned a shot of herself recording in the studio.
After Christina Aguilera contacted A Great Big World to be a part of their song Say Something, the duo was surprised to find out she had no intention of having a solo.
