Watch Oxford University’s All-Male A Cappella Group Sing ‘All I Want for Christmas Is You’

Out of the Blue (OOTB), Oxford University’s all-male a cappella group, has released a cover of Mariah Carey’s holiday hit “All I Want for Christmas Is You” and a music video filmed at the historic school’s Bodleian Library and Divinity School.

Proceeds from purchases of the single will be donated to the Helen & Douglas House Hospice for Children and Young Adults.

The group claims its cover of Shakira’s “Hips Don’t Lie,” released over the summer, raised more than £10,000 ($15,700) for the charity. It also boasts more than 5.1 million views so far—thanks to some Twitter encouragement from the Colombian pop star herself.