Subway Violinists Perform Taylor Swift’s I Knew You Were Trouble [VIDEO]

And no singing goats!

Actually, there's nobody singing.  These are the Subway Violinists.  Their name completely explains what they do...  They play the violin on the subway, and then they film it for YouTube.  But they're crazy-good and play a lot of modern popular music!  Here they are covering Taylor Swift's "I Knew You Were Trouble."