I recommend a USB audio interface if you want to get into some more professional quality recording. For podcasts and DIY song tracks that you can mix yourself in Garageband, you can probably use the built-in Mic. Now, you’ve got a host of editing equipment, from sound to video at your fingertips, which is surprisingly easy to use. If you want to enjoy some tasty tunes through your speakers or in hi-def sound quality through some cushy headphones, I recommend finding a radio station that you like. In case you didn’t know, iTunes has a ton of radio stations available. So go to it, do this now, Macs are made for music!