Holly Humberstone debuted a new track called ‘Please Don’t Leave Just Yet’ at Tramlines Festival over the weekend – watch the performance below.The Lincolnshire singer-songwriter played the T’other Live stage on Sunday (July 25), as part of a line-up that included The Snuts, Sundara Karma and Everything Everything.During her set, Humberstone performed ‘Please Don’t Leave Just Yet’, a collaboration with The 1975‘s Matty Healy, and it’s her first new track since May’s ‘The Walls Are Too Thin’.“One