Record what you hear (on a Mac)

Lifted this information out of some forum. Thought I would save it.

5 easy steps
1. Install Audacity, and AudioHijack Pro trial.

2. Open AudioHijack and ignore nag messages. Go to "audio hijack pro" main menu, and select "install extras". Select "soundflower", and install. When it's done, you can close AudioHijack.
You're not stealing anything by doing this - soundflower is freeware anyway. There's probably another way to install it - I just haven't investigated how to.

3. Go to applications, utilities, "audio midi setup", and change the default output from "built-in output", to "soundflower (2ch)".

4. Open Audacity, go to "audacity" main menu, "preferences", and change the recording device to "soundflower (2ch)", and tick the box that says "software playthrough".

5. Hit record in Audacity and play whatever you want to record.
It records anything that you can hear that runs through the default output, which includes iTunes, Realplayer (bbc stations), the bbc radio player widget, etc. You can see sound levels, and if it's too loud or quiet, adjusting the volume you hear adjusts the recording volume - just like windows.

Note: You can only hear what's playing while Audacity is recording. When you stop recording, it all goes quiet. After you've recorded whatever you wanted, go back to applications, utilities, "audio midi setup", and change the default output back to "built-in output" again.