If you like Radiohead you'll probably love a little group called Clann Zu.
With an ensemble featuring violin and keys, along with a traditional four piece setup, Clann Zú create beautiful dark melodies ranging from the intimate and sparse, to the huge and dramatic. The bilingual vocals (Irish and English) of Waterford born, Declan de Barra are intense and passionate, with lyrical themes running from dispossession, cultural reclamation and resistance, to hopelessness and desperation. Although drama can often be a simile for pretension, Clann Zú execute it genuinely and gracefully, managing to create honest and punishingly beautiful songs.
Their website is Clannzu.com, and they have a few downloads available on the site, but they just samples.
Some favorite tracks are:
Words for Snow
The Sailor Who Fell From Grace with the Sea
5000 More
One Bedroom Apartment
I strongly recommend checking them out.