Sir Neville Marriner, 90, to conduct at the Proms
8 August 2014 Last updated at 19:25 BST
When Sir Neville Marriner takes to the stage at the Royal Albert Hall in London he will become the oldest conductor ever to lead a Prom.
Ninety-year-old Sir Neville began his musical career as a violinist before founding his own orchestra and then picking up a baton.
Arts Editor Will Gompertz went along to rehearsal to meet one of the most recorded conductors of all time.