Album: Godspeed You! Black Emperor, 'Allelujah! Don't Bend! Ascend! (Constellation)

The military connotations of the word "drone" having risen since the Afghan war, the drone-heavy fourth album by Canadian post-rock collective GY!BE is surely one almighty musical pun – the 20-minute opener builds to a central passage reminiscent of trundling tanks.

It's all a bit "junior school music project" at times, and there's nothing John Cale wasn't doing half a century ago, but it's nevertheless an impressive work.