Your Podcave subscription comes with a music library, provided by Benztown. It's included in your subscription. Here's how you get it...
Navigate to your podcast, and to Web & Social
Next, you'll click on Music Library
From here, you will request your credentials. This generates an email to Benztown, and they will create your login for you. They will then email you directly with your information. From that point forward, you will be able to login to Benztown and download up to 10 pieces per month.