Plot: In the last of this season's Sunday night programmes from the Henry Wood Promenade Concerts Riccardo Muti makes his debut on television and at the Proms. He is the principal conductor of the New Philharmonia Orchestra led by BERNARD PARTRIDGE The programme includes Mendelssohn Symphony No 4, in A (Italian) Mozart Sinfonia Concertante in E flat, for violin and viola (K 364) with soloists Carl Pini (violin) Csafea Erdelyi (viola) Introduced by RICHARD BAKER Director ssnis MORIARTY Part of last night's concert