How to output an MP3 file?

I'm trying to route all my MP3 requests through a brief PHP script to log the downloads to a database, and then I want to output the MP3 exactly as if the browser had requested it normally. So far I haven't found headers that will serve it normally; it either wants to download it as an attachment or an application. I want the browsers to treat it however they normally treat MP3's, usually playing in the browser window. Here's what I'm doing: (my MP3 files are all named podcast-xxxx.mp3) where $id is the xxx: header('Content-Type: application/octet-stream'); header('Content-Disposition: attachment; filename=podcast-'.$id.'.mp3'); $size = filesize('audio/podcast-'.$id.'.mp3'); header('Content-Length: '.$size); readfile('audio/podcast-'.$id.'.mp3'); What should I change? - Brian