Jonathan Swain throws the spotlight onto the BBC's performing groups, who provide the backbone of every year's Proms performances including on the first and last nights. Also the complete cycle of Haydn's mature String Quartets draws to a close with his Op 76 and Op 77 sets. The Haydn expert is the Lindsay Quartet's Peter Cropper. Francis Chagrin: Aquarelles (Portraits of 5 Children) BBC Concert Orchestra Roderich Dunk (conductor) Montague Phillips: Piano Concerto No 1 in F sharp minor David Owen Norris (piano) BBC Concert Orchestra Gavin Sutherland (conductor) Alexander Mackenzie: Benedictus (arr. for small orchestra) BBC Concert Orchestra Barry Wordsworth (conductor) 2.45pm Haydn: String Quartet in D, Op 76, No 5 Hagen Quartet Sethus Calvisius: Singet dem Herrn ein neues Lied Stephen Farr (organ) BBC Singers David Hill (conductor) Haydn: String Quartet in F, Op 77, No 2 Quatuor Mosaiques 4.55pm Beethoven: Symphony No 9 in D minor (Choral) Wendy-Dawn Thompson (mezzo-soprano) Timothy Robinson (tenor) Matthew Rose (bass) BBC National Chorus of Wales BBC National Orchestra of Wales Francois-Xavier Roth (conductor).