Cheryl, The 02, London

On paper, a Cheryl arena gig should be a corker – she’s a former Girl Aloud, for goodness’ sake, and the only one who’s made a solo career fly. In practice, unless you’re obsessed or eight years old, it’s a strangely flat experience.

Play Gustav Holst on Mars? Nah, let's have Will.i.am

The film Alien popularised the phrase "In space no one can hear you scream", and with that logic, no one can hear music either. But that hasn't stopped various attempts at playing tunes in a galaxy far, far away.

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Holograms: Seeing double

Holograms have come a long way since the blurry images of the 1980s – and they're letting people appear in two places at once, discovers Holly Williams