The Brighton based seven-piece progressive-jazz-rock band. Woodwinds, Guitars, Basses, Drums, Singings, Synths, Pianos & Organs meld together to make the musical cake of Diagonal.
More information:
https://diagonal.bandcamp.com/
https://www.facebook.com/diagonalband

There is another band called Diagonal -

Diagonal (1999 - 2004) is a Brazilian band from São Paulo influenced mainly by names of the "post-punk/post-hc" as Gang of Four and Jawbox. The musical proposal of the four members of diagonal is clear and explores to the maximum the possibility to try new paths and textures.
More information: http://www.submarinerecords.net/english.html
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