Bra cup size Choir goes viral

Forget the lame old "Do, Re, Me" - How about bra sizes A through G?

Though it would do wonders for 3-D TV sales, this viral ad is actually advertising a line of bras.

To exactly whom, we can't be sure.

The 'La Senza' lingerie company has notched more than a million hits since this clip debuted on YouTube just a week ago.

The video introduces the so called " Cup Size Choir " members by their measurements, then features each one singing a corresponding note to the tune of “Deck the Halls.”

The company also features a website where uses can "Play the Cup Size Choir" themselves, using the keys on their keyboard.

'Tis truly the season to be merry.