这张专辑包含四首先前未发布的曲目。

The album includes four previously unreleased ___tracks.

给每张CD配一本书，包含光盘上每首曲目和表演的信息，这是一个非常好的主意。

It is a really good idea to give every CD a book containing information about every ___track on the disc and about the performance.

专辑中我最喜欢的曲目是开场歌曲。

My favorite ___track on the album is the opening song.