The benefit of books is that they are interactive and most studies show that joint book reading does wonders for children's vocabulary, plus there is information that just spending that parent directed time (the parent focusing on the child) helps to motivate children to learn and want to read books. Also, with picture books, you have the images and parents can break off as they normally do pointing to various pictures and discussing the story with the child.
"Look! There's a bird. It's flying. You saw a bird yesterday at the park, remember?"
"Do you see a blue bird?" "Right, there it is. Good job!"
etc.
That being said, DevonT is a member of this site and he has two CDs that are excellent for young learners. They are designed for kindergarten aged students. He is an EFL teacher and designed the songs for his classes, specifically to teach English. The songs are slow, simple and clear. I have both CDs and they are excellent. There is a very appropriate use of fast and slow rhythms that all students can enjoy. You should check his stuff out
Super Simple Songs