According to

Pink Floyd is celebrating the 40th anniversary of the U.K. release of its landmark 1973 album The Dark Side of the Moon with a special online event that the band's official website is hosting this weekend.  For 24 hours starting at 7:01 p.m. ET this Saturday, the album will stream in its entirety at  At the same time, fans will be able to send messages and photos via Twitter that will affect a specially designed moon featured on the site.

The tweets, which can be sent using the hashtag #DarkSide40, will automatically cause a side of the moon depicted at to darken.  Also in conjunction with the anniversary, newly created variations on artist Storm Thorgerson's prism design featured on The Dark Side of the Moon's cover are being unveiled daily at the website through this Sunday.  The designs eventually will be combined to form a digital poster that fans will be able to download.

One of the best-selling and most critically acclaimed albums of all time, The Dark Side of The Moon also introduced the iconic album cover artwork by Storm Thorgerson of Hipgnosis, after a request for a ‘simple and bold’ design. To celebrate the 40th Anniversary, Storm Thorgerson and Storm Designs have created 14 exclusive new prism designs that will be unveiled daily on These prism designs will gradually form a celebratory poster, downloadable in three different sizes on March 24, 2013.

Can't wait:)