Apparently it’s called ‘expectation management’. Pollux, Esa-Pekka Salonen’s new work for the Los Angeles Philharmonic Orchestra, takes its name from Greek myth. But as Salonen explains in his programme note, there’s more: lots more. It’s intended to form a diptych with a second piece called (naturally enough) Castor. It’s also part-inspired by Rilke’s Sonnets to Orpheus, and an image (Salonen compares it to Salvador Dali) of a tree growing out of an ear.