It had been 8 years since the beloved Scottish electronic act Boards of Canada released an album. The promotion of their fourth studio album, Tomorrow’s Harvest, proved to be as mysterious and intriguing as the band themselves.

The duo created a treasure hunt that began in April on Record Store Day. A vinyl recording containing 20 seconds of cryptic material was released worldwide. The recording hinted to 1 of 6 different 6-digit numbers of which the significance was unclear. In the following weeks, the remainder of the 6 numbers were revealed through channels Twoism, Cartoon’s Network’s Adult Swim, NPR, BBC1, and YouTube. Boards of Canada then launched a web address where fans could enter these codes, gaining access to a website where a a final video revealed the announcement and release date for Tomorrow’s Harvest.

With acts like Daft Punk and Kanye West launching huge, highly-publicized marketing campaigns, there is something to be said for a group that promotes a new release in a manner that reflects the subliminal, cult-like nature of its sound.