Rustie: Green Language review – techno with a touch of birdsong

Rustie's hyper-enjoyable second album derives its title and some odd peacefulness from an unlikely source: birdsong, aka the green language, which was to medieval mystics the perfect mode of expression. Rustie is making that same claim for his music, which, if toned-down and thoughtful by his standards, is forcefully ebullient and direct by anyone else's. Synthetic prog rock, vocoders, hard house and video-game sounds strike an optimistic tone, undercut by darker suggestions from the guest rappers – grime hero D Double E, Detroit's unique Danny Brown and the shady duo Gorgeous Children.