Implementing the SongList the container

Hi, I'm trying to test one example of "Programming Ruby" - Implementing
the SongList the container, I do not know if I am making sure the class
would be something like this:

Code in Annex

But return SongList.rb:20: uninitialized constant Song (NameError)

Attachments:
http://www.ruby-forum.com/attachment/2884/SongList.rb

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Sorry I missed ... too .. already working ... lacked the class Song:)

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