Frontman also calls Rihanna 'the Frank Sinatra of our generation'
Brad Schofield surprised his girlfriend who thought he’d ask later that weekend
The singer guests on the band's 'Princess Of China' track
Band will play four shows at the venue this week
The up-and-coming band were tragically killed during a car crash in Sweden in February
Laura Mvula, Nico & Vinz and George The Poet will also perform for Sentebale charity
Band also performed 'Up&Up' and 'Hymn for the Weekend' live
Song is lifted from latest album 'A Head Full Of Dreams'
Frontman speaks in interview with Zane Lowe on Beats 1
Singer also played a Coldplay rarity at charity fundraiser