Royal Festival Hall, London SE1 (0171-960 4242) 7.30pm
The musicians of Birmingham divide neatly into two groups today. In the latest of their enterprising matinee series, the CBSO, conducted by Sakari Oramo, plays Nielsen's Helios Overture and Flute Concerto, with Shostakovich's 5th Symphony. Meanwhile, this evening, it's the turn of the City of Birmingham Symphony Chorus to shine in short, a cappella settings by Holst, Taverner and Allegri, prefacing Rachmaninov's luminous treatment of the vespers.
Symphony Hall, Birmingham (0121-212 3333) 2.15pm and 7.30pm