need help in describing a piece of music or a song.

2 answers

Read many of these articles. Take good notes. Then use the ideas to complete your assignment.

http://www.google.com/search?sourceid=chrome&ie=UTF-8&q=how+to+describe+piece+of+music
listen to it. Describe how it makes you feel.
http://www.youtube.com/watch?v=WxPSToloHtw&feature=related