Some clues:
Puzzles 379 and 380 are by composers of the same nationality, though the composer of Puzzle 380 had adopted a different country as his home by the time he composed the work extracted here.
Both puzzles also date from the same decade, and are of considerably older vintage than the Joan
Rivers Tower piece mentioned by Mr Fragment.
Still no takers?
Not even a wild guess? Mr Sudden? Mr Martle?
Another clue is called for: No 380 was unless I am mistaken composed in a location more commonly associated with sport, although I doubt its composer was thinking of cricket balls when he named his symphony.
No 379 has a title which would not have seemed strange to the composer of No 378 (solved by Mr Grew), except for a slight grammatical oddity.
Still no takers?!
I believe that Members have until a few minutes after midnight tonight to save me from some sort of expiry-related points loss (I don't know the exact details, but it sounds unpleasant).
So, to expand on my answer to hh on the Discussion thread, the work of which Puzzle 379 presents the opening is not a string quartet but a piece for 13 solo strings. Their composer did compose one string quartet in his career, but that was in 1965, 6 or 7 years earlier than the current piece. He was born in 1913.