For just 24 hours beginning at 7:01 p.m. ET this Saturday, the record will stream from beginning to end via the band's official website. As the album is streaming, fans will have the chance to Tweet messages and photos that will alter a special moon on the website.

Here's how it works: Fans may tweet their messages using the hashtag #DarkSide40, and the messages will cause a part of the moon up at PinkFloyd.com to darken.