. . . for 519 a punt at the Bartók 1st quartet.
No not really!
523 sounds as though it could only be Schoenberg but which one? We shall try the Third Quartet.
Nor that not really!
521 reminds us rather of the Barraqué Concerto.
Yes that is correct - we had suspected the Member might know it. It was the composer's last finished work, premiered at the Royal Festival Hall in 1968 by clarinettist Hubert Rostaing and the B.B.C. Symphony Orchestra conducted by Gilbert Amy. It is a concerto in the course of which the contributions of the soloist are in fact somewhat rare.