Create a diagram using a diagramming tool AND provide a written text-based document explaining your relationship mapping (systems analysis use case document).
Requirements:
 

You will work with book/music/media information, user information, ratings of books, and users social network
Each book has an id, title, publication date, publisher, ISBN, functional category, page count, price (publisher), and product description
There are 3 categories of book: fiction, non-fiction, and specialty
There are 2 categories of music: digital and media-based
An author can write one or more books.
A musician can be a solo artist, part of a group, or both
An author can also be associated with one or more publishers.
A musician/group/act can be associated with one or more record labels (consider this a possible type of publisher)
An authors book can have one or more editions.
A song and or album can have more than one version/edition (i.e. EP, LP, CD, DVD etc)
A publisher can have many authors and many books.
A record company can have many artists associated and many albums associated with it. 
A record company can also be the publishing company (i.e. self-publishing – i.e. think Amazon)
Many ISBNs can also be associated with a given publisher but only one ISBN per form of medium (i.e. the ISBN is the PK no matter what).
An author can write many books.
An artist can write many songs, albums etc.
UCOnline needs to keep track of user ratings for each item sold in the online store (e.g., 1-5 and 1 for ˜Dislike, to 5, for ˜Awesome!).
A particular user rates a particular item at a given time.
A user CANNOT rate the same item multiple times unless there are multiple editions of the item.
Each edition can be rated separately.
Each user who submits a rating will be identified by a unique id and has a name, gender, age, and location. Nothing is anonymous.