Here comes (another) slow, dark, almost depressive piece by Mercy Machine. It has German lyrics and spreads a very very dark, melancholic mood, while still being nice to listen to.
Next up is something much, much brighter and happier, I promise ;)
If you like the tune, make sure to also checkout this other version, which puts more emphasis on the violins, IMHO.
A fine fiddling tune by Phil Newton (violin) and Tom Joad (guitar) called "High-Flyer Stomp".
And now for something completely different — progressive alt-rock by Arthur Yoria.