Plot: Vladimir Jurowski's Hungarian Prom kicks off with Kodály's effervescent Dances of Galánta. Bartók's more acerbically ebullient First Piano Concerto will give pianist Jean-Efflam Bavouzet a chance to use both hands: his previous Proms appearances, in 2008 and 2010, both involved pieces conceived for the left hand alone! In tonight's second half, an influential masterwork from one of this year's featured composers, born 200 years ago