Sibelius appreciator here, although Shostakovic ain't far behind.
Sibelius' violin concerto in D; Viktoria Mullova has made an excellent recording.
Shostakovic's Gadfly seems to crop up through my speakers very regularly (all my music is lossless ripped so I can listen to it from a PC, which is connected to my amp)
Umm, Yoyo Ma doing Bach's cello concertos is another - was used in the film Master & Commander .
I do like Mozart, but I use it to help me concentrate, not relax.
Mahler 4th symphony.
There are probably more. Oh, and Dickens - thirded. Just tedious.