The first time you start Songbird, you will be asked to Import Media:
![Import media](https://image.prntscr.com/image/vYsUCU_gQ0q54TmMDc1yGg.jpeg)
Specify the path where your music is located on the disc and then start SongBird. You will find all the music files under the Library menu on the left tree.
Additionally, start SongBird and go to File > Import Media. Repeat the procedure of adding additional folders with content and you'll see them into the application.