These guys are excellent musicians, too good really to be on the street preforming for money.  I was amazed at their human jukebox performance.  Their name is  Collective Cadenza. AKA CDZA.  The "Jukebox" has Charles Yang on violin and Michael Thurber on bass. Playing everything from the Jurassic Park Theme to Lady Gaga,Bach, and Michael Jackson, in fast foward and slow motion.  All you have to do is step up and put some money in the jar!  Wait till the end when you see what they do with the money.  These are some amazing guys!