The new expanded editions include a 48-page 12x12 book packed full of iconic photos, new interviews, liner notes and memorabilia.
Stars including Radiohead and The 1975 have already joined the mission seeking to revitalise how the music industry tackles climate disaster.
With partner Daevid Allen, Smith formed the first incarnation of Gong in 1967.
The remastered digital version of the influential 'Mezzanine' is also available next Friday, 23 August on 2CD and digital.
Praised for its diversity and impact, 90s dance music is to electronica fans what the 60s were to classic rock aficionados.
The Bristol collective hit the UK summit for the first time with the 1998 album.
So emotive that it almost finished them off, ‘Mezzanine’ proved that Massive Attack are among the best artists of their generation.
The trip-hop icons are currently on tour in support of the 'Mezzanine' reissue and tonight play London's 02 Arena.
Their second UK No. 1 album was described by one reviewer as "a masterpiece of haunted sonics."
Produced by Dennis Bovell, 'Cut' was originally released in September 1979 and it remains a post-punk touchstone.
The original version of 'Wire' dates from the band's 'Mezzanine' era, but featured in the soundtrack to the 1997 film 'Welcome To Sarajevo'.
Continuing their 20th anniversary celebrations for their seminal release 'Mezzanine', Massive Attack have shared a free music app that allows users to create interactive remixes of the album’s tracks.
The track is taken from the deluxe 20th anniversary reissue of iconic Bristolians' double platinum 'Mezzanine' album.
The Bristol duo also shared they’ll be playing shows with Cocteau Twins’ Liz Fraser, who lent her vocals to the Mezzanine single ‘Teardrop’.
Emerging from Bristol in the late 80s, Massive Attack soon became the act of choice for forward-thinking music, as 20 of the best Massive Attack songs show.