iTunes high temperature

Hi everybody

1. Turn on Itunes

2. start song

3. minimize itunes to the dock

4. iTunes using 100% CPU and more

5. Temperature up to 80 - 85 C

6. The surface of macbook is very hot... uncomfortable

there is video

http://www.youtube.com/watch?v=fWHJYzMEVjE&feature=youtu.be

Can somebody help me?