A cappella wins at life.

Out of the Blue knows.

Oxford University’s all-male a cappella group sang a glorious rendition of Mariah Carey’s “All I Want For Christmas is You” 1994 hit single, which turned 20 years old last month, and we haven’t been able to stop singing it since.

This is not a complaint.

The arrangement and music video were put together to promote the Helen & Douglas House charity, which provides support for families requiring children hospice care in the U.K.

Filmed entirely on the Oxford campus, Harry Potter fans will recognize the background as the primary filming location for Hogwarts School of Witchcraft and Wizardry. The group was even granted special permission to film inside the Bodleian Library of Oxford, including the gorgeous Old Schools’ Quad and the Divinity School.

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Photo credit: Out of the Blue (Facebook)