You can probably guess pretty much what this is about by the name, but in case you're feeling slow today: for the second year, London takes part in an international celebration of music. Free events around London include mini-festivals in Shoreditch Park and Markfield Park, a mass open-air vocal performance called 'Crowd Out' and gigs at loads of venues across the city. Check out musicday.org.uk/events for the full details.
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