Randomizing a php include

hello there.

I’m in the middle of re-designing a record label fan site (im a bit sad, yes) and I want an include to appear to the right of the main content, the page included should have an image of a band & a sentence about them.

So basically a bog standard html page.

I know how to actually include the file in the page, but because there’s more than one band, i want it to randomize each time someone logs on.

How do I do this?