A performance by the John Wilson Orchestra is always a highlight of the Proms season, and this year it’s paying homage to American songwriters George and Ira Gershwin, with regular John Wilson collaborator Matthew Ford, West End musical actress Louise Dearman (Wicked) and actor and singer Julian Ovenden (Downton Abbey and Foyle’s War). Katie Derham presents a live Proms Extra earlier at 6.50pm from the Albert Hall.