If you think about how small children love to tap their feet to rhythms and hum along with songs, you can understand that these are good educational tools.
Who said that lessons should be boring, and teacher centered? If you've been in a classroom recently, especially one in which students are learning a foreign language, then you'll know that DVDs and CDs are tools that are used by teachers to promote language learning.
Think back to your childhood, didn't you learn the letters of the alphabet in a song? You probably still remember it after all these years too, if you're honest.
In the UK, the BBC realized years ago that there was a market for cartoon films that could be used in English as a foreign language classes for small children, and they created Muzzy a large green monster figure who had adventures in Gondoland.
Muzzy was very popular for some years.
Outside the foreign language classroom there has been the success of "Sesame Street" which was as educational as it was entertaining.
Everyone learns best when they are relaxed and happy, so songs and DVDs are a wonderful way to promote learning.
When children start to learn a foreign language, they are taught songs with catchy tunes, and you can hear them singing them on the street with their friends when they leave classes.
There are CDs for such activities, and those with nursery rhymes can be used, especially modern nursery rhymes, which are often action songs, "Itsy Bitsy Spider" for example.
Some DVDs have subtitles in English as well as being in English, and these are good for children who can read a little as they can help improve a child's reading ability.
However, a child is usually more able to learn a foreign language by listening, than is the average adult, so subtitles are not necessary.
Logically a child should be encouraged to learn by having DVDs and CDs of songs, not only at home, but also in the classroom.
They can make a child's educational experiences happy and enjoyable.