english listening material recommendation? thank you in advance!

I am new here, and thank you in advance for your help!

My 6-year old nephew will visit me from china in a month. He knows a little bit of english, but of course not much. I am trying to put him in a kindergrten here for about two months to practice his english. Everyday, we have about 1 hour driving on the road, and this is very good opptunity for me to help him pracitce his english. I would like to get some english listening material playing in the car CD to help him practice his listening and speaking. Does anyone here can recommend good, simple english listening material for a 6-year old? I want something interesting, simple, and fun for a 6-year old.

Thank you very much!