Pink Floyd are known for their double-disc albums and 20-minute songs, but the band's next release is set to leave fans comfortably numb.
The Early Years 1965-72 is a mammoth 27-disc set covering the band's first seven years. It'll have 130 tracks, many of them never released before, including outtakes and demo recordings.
There will be 12 hours of audio and more than 15 hours of video, plus seven-inch vinyl singles.
The band's label said Early Years will "give collectors the opportunity to hear the evolution of the band and witness their part in cultural revolutions from their earliest recordings and studio sessions to the years prior to the release of The Dark Side of The Moon."
Pink Floyd put their first bricks in the wall in the mid-1960s, improvising acid-tainted rock for hours in front of London art crowds.
After their lead songwriter Syd Barrett's drug use saw him lose touch with reality, the band dumped him and spent the next half-decade experimenting with different sounds and styles across albums like Meddle and Atom Heart Mother.
By 1972 they'd developed a set they called 'Eclipse', made up of songs written by new bandleader Roger Water. In the studio those songs formed the basis of The Dark Side of the Moon, which went on to sell an estimated 45 million copies worldwide.
The Early Years 1965-72 will hit shelves - or walls - in November.
Pink Floyd released their final studio album, The Endless River, in 2014. Singer and guitarist David Gilmour recently said the great gig in the sky was finally over.