• Write classes that are related via the "belongs to" relationship.

In this lab, you'll be coding a Song and Artist class. A song should belong to an artist. You'll also be coding a Post and Author class. A post should belong to an author.

• Artists should have a name.
• Songs should have a title and belong to an artist. A song should be able to tell you the name of its artist:

song.artist.name
  # => "Beyonce"

• Posts should have a title and belong to an author. A post should be able to tell you the name of its author:

post.author.name
  # => "Hillary"

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