I was just wondering if anyone knew where I could get free sheet music for the theme tune to the O.C please.

You probably won't be able to get it free, coz the badnd who wrote it are still really big. You could try and work it out or it's only £.50 for most single music like that.

Do you mean 'Phantom Planet', California? I love the OC! But i havent seen this music anywhere for free, but elmo is right, it wouldnt cost a lot to buy it....

You would probably only be able to find guitar tab for free. A quick google search pulled up:

http://www.guitartabs.cc/fetchfile.php?fileid=2123437

And if you wanted the actualy sheet music, you could use Guitar Pro or something to convert it. Likely that it still wouldn't match the quality of buying the sheet music though.