Declan McKenna performs IsombardThis video can not be playedTo play this video you need to enable JavaScript in your browser.Declan McKenna performs IsombardCloseDeclan McKenna performs Isombard on the BBC Introducing Stage at Radio 1's Big Weekend 2016.Published7 April 2017SectionBBC NewsSubsectionEntertainment & ArtsShareclose panelShare pageCopy linkAbout sharingRead description