Awhile ago my Dad, brother, sister and I all went and saw the Polyphonic Spree play at the Henry Fonda in L.A., and as you might expect if you are familiar with the Spree, it was awesome. That night they covered Nirvana's "Lithium" as an encore, and I immediately loved it. Everything about this cover is right: the original song is good in the first place, the cover doesn't mess with the tempo, tonality, or melody significantly, and the covering band still has something unique to offer. In this case, that "something" includes orchestral instrumentation, a mini-choir, white robes, and the uber-happy style that defines the Polyphonic Spree.
Anyway, my Dad passed on the official music video for it, which is just the Spree playing it live with a high quality recording. But what more could you want for a video of this band doing this song? Enjoy: