Emerson String Quartet
"Shostakovich: String Quartet no. 10" (CD)

Composed in 1964, this quartet is deceptively deep despite its brief length (22 min.)
Written for the Beethoven Quartet (as many of his late quartets were) the 10th quartet retains some of the whimsy of his middle quartets but begins to turn in tone and timbre towards the more introspective commentary that becomes familiar in his late quartets.

This is also more homework for future music-learning.