iTunes: Multiple Libraries

I have one library for DJ tracks (Serato), and another library for listening music.

To create or use a different iTunes library:
  1. If iTunes is open, quit it.
  2. Hold down the Option key while you open iTunes.
  3. In the dialog that appears, do one of the following:
  4. To create a new library, click Create Library.
  5. To choose a different library, click Choose Library.

Apple: Using multiple iTunes libraries