This is a single CD with 3 tracks: the opening, ending, and one of the main songs. The songs on this CD include: 1. Rainbow Notes- The full version of the second opening to the first season of the anime. 2. Sekai de Ichiban Hayaku Asa ga Kuru Basho- This is the full version of the second ending to the first season of the anime. The title translation is: The Place Where the Morning Comes First. 3. Kizuna- One of my favorite songs the mermaids sing. This is the full version of Kizuna, sung by Lucia, Hanon, and Rina. The title translation is: Bonds. These are all the full versions, versus the 1-2 minute versions in the anime, so this is a great CD for any Mermaid Melody fan. Each song is around 4 minutes long.