So how much did Paul McCartney and all the other musicians get paid for performing at the Opening Ceremony? A BUCK-57!

They basically donated their time, but they were paid a token fee of ONE BRITISH POUND . . . which comes out to $1.57.

Here's Paul performing 'Hey Jude' at the opening ceremonies:

Meanwhile, rumor has it that British boy band One Direction will play the Closing Ceremony on August 12th.  There's no word whether they'll get one pound for the whole band . . . or one pound per MEMBER.

If these guys get paid more than Sir Paul, I'm goping to punch somebody...