
R Strauss, Metamorphosen, Karajan, BPO

Schoenberg, Transfigured Night, Karajan, BPO

Ligeti, String Quartets, Arditti SQ

Berio, Voci, Kashikashian
I believe that they are all deep, dark, haunting strings. First two are a bit old (?) recordings, but their sound is sufficiently good. 'Voci' is not a string only music, but it fits the characters well and the recording is great.
@I've tried to include images for the first time. Hmm... perhaps they are too spacious?