See A Late Quartet for the performances.  Flawless.

Christopher Walken, Catherine Keener, Phillip Seymour Hoffman, and Mark Ivanir are members of a renowned string quartet called The Fugue, a suitable name for the group and the film.

The story is fairly simple:  after twenty-five years of international success, the oldest member of the quartet (who taught the others years before) announces his retirement after a diagnosis of Parkinson’s disease.

The power vacuum created by the transition opens the doors for long-buried jealousies and desires to erupt with a ferocity that may or may not be surprising.  At any rate, due to the skill of the performers, every moment is believable, and the actors make the film soar above what might otherwise be seen as minor deficits in the story and style of the film.

Well worth seeing.  Every moment is engaging.