It's a testament to the srength of the The XX' sound that, although they are surrounded by harps and sweeping violins, their signature guitar plucks and sigh-heavy vocals are still the centre of attention during their live BBC performance.
Here's the BBC link.
You might want to skip to the 0:55 mark to get to the performance, recorded live at the Bridlington Opera House.
And here they are playing an even more stripped-down version of Angels live in a Tokyo hotel room.
[youtube dYXejsku99Q nolink]
