The Thin Air was always rubbish at maths (GCSE Grade B, y’all!). Frankly, we couldn’t see the point. Now, of course, we very much regret not concentrating more on the ol’ sums. For one thing, it’s embarrassing being unable to work out whether you’ve been given the correct change in a shop. For another, if only we’d been better at the subject we could have ended up like James Holden, self-confessed mathematics nerd, feted DJ and producer and – with his second album The Inheritors – producer of some of the most dense, dissonant and downright uncomfortable sounds you’re likely…