Singer/songwriter will perform in London tonight (February 21)
Envy Corps had previously been scheduled to play the slot, but have since pulled out, meaning Harcourt was called on to play instead.
Tickets will be available for the show on the door tonight.
The Shockwaves NME Awards 2008 are coming soon – and it’s time to have your say. Vote now by heading to NME.COM/awardsvote and you could win VIP tickets to the ceremony, which takes place in London on February 28.