A post at Idolator with a self-explanatory title -- "YouTube Users Post The Craziest Things" -- provides links to a smörgåsbord of musical stylings, ranging from New Order to Roxy Music to Miles and Coltrane, drawn from, yes, YouTube, in the course of which we learn that the Pet Shop Boys, of all people, created and performed a new score for that bulwark of Film Studies 101, Sergei Eisenstein's Battleship Potemkin. Some enterprising soul has taken the whole thing, as performed in Berlin in 2005, and posted it in 28 bite-sized video snippets.
The YouTube upload has the triple drawbacks of (1) being on YouTube and thus of dubious video quality, (2) being handheld footage of a live performance, and (3) being in 28 bite-sized morsels. However, a further search at France's Dailymotion turns up a good-quality version of the sequence at which one most wants to take a proper gander -- the Gunpowder 'n Baby Carriage extravaganza that is the Odessa Steps:
The PSBs' score seems not to have been all that well received when it premiered in 2004. ("[D]ecidedly ho-hum and noodly," said the BBC.) Should you wish to make up your own mind about it, there is no complete, synced DVD version, but a recording is available. For the full experience, you might play it while watching the forthcoming 2-disc Kino edition of the film. (Further details here.)