Until 27th July, Californian multimedia artist Doug Aitken takes over the Barbican for a free, 30-day "happening" inspired by his 2013 event in which he and a number of other artists travelled across the US by train, staging performances as they went. Station to Station features more than 100 different events, including work from artists Martin Creed, Olafur Eliasson and Ed Ruscha, plus New York punks Suicide in concert and a new piece from musician Terry Riley. You'll be able to watch the latter prepare live for his concert, though this and many other events are ticketed, so do check the website.
There's more music at the National Gallery for Soundscapes (from 8th July to 6th September), which sees musicians and sound artists including Jamie xx create pieces in response to paintings in the collection. Jamie xx has chosen Théo Van Rysselberghe's pointillist Coastal Scene while other contributors include award-winning film composer Gabriel Yared, who's responded to Cézanne's Bathers, and wildlife programme-maker Chris Watson, who has chosen one of the gallery's most popular works: Akseli Gallen-Kallela's Lake Keitele from 1905.