Sure, why not. Links to Paul Hindemith's Op. 22 string quartet played by the Amar-Hindemith quartet

String Quartet Op.22 by Paul hindemith
Performed by the Amar-Hindemith quartet, recorded in 1927
Movement 1
http://www.youtube.com/watch?v=c5IGgeN8slA
Movement 2
http://www.youtube.com/watch?v=9WaARFJ0dK0
Movement 3
http://www.youtube.com/watch?v=XwUYzjBJj84
Movement 4
http://www.youtube.com/watch?v=wQJGhcNcN6E
Movement 5
http://www.youtube.com/watch?v=zkSCZ0gvBe0
The recording from 1927 has the limitations you'd expect from the time and in movement 2 the quartet sounds like they hit the resonant tone of the room which leads to a sustained hum that, I assure you (having studied the score over the years) is not in the score.

It's Thanksgiving week here in the United States and so you'll forgive me if I end up just throwing up a bunch of links to things that interest me and you won't be hugely surprised that ends up being music.