Hot on the heels of the Urban Classic Prom came this, the BBC 6 Music Prom. Yet another first in this year’s Proms saw BBC Radios 3 and 6 Music bring together the likes of Cerys Matthews, Laura Marling, Xenakis, The Stranglers, Varèse and the London Sinfonietta, and produce a programme comprising styles that might loosely be described as “alternative”, from the fringes of pop to punk rock via mode