The stars Take your pick: there are "jazz giants" of the likes of Sonny Rollins, Herbie Hancock, John McLaughlin, and Jack DeJohnette (celebrating his 70th birthday). Fresher performers include the Robert Glasper Experiment with Doom, Hyperpotamus, Esperanza Spalding and Mara Carlyle. The opening gala promises to kick things off with a swing, with Guy Barker's celebration of "a century of song" featuring the vocal talents of Imelda May, Patti Austin, Juliet Roberts, Claire Martin and Junior Giscombe. Lucinda Williams gets a whole weekend at the Barbican, while two big bands – the UK's Beats & Pieces and Norway's Ensemble Denada – join forces to blow you away, as may Macy Gray with the David Murray Big Band. Heads Up: London Jazz Festival Blowing its trumpet: London Jazz Festival swings into town http://www.londonjazzfestival.org.uk/