Design
- All non-anonymous users could follow listener, musician and critic. They can view and play music in their playlist. Critic and musicians` popularity can be determined by their followers.
- General users can give comments and rates to musicians and critic.
- General users can like a song or a playlist.
- Critic can leave highlighted comments and rate to musician.
- Publisher could buy songs from musician, publisher will give musician an offer and musicians will have a certain time to response.
- Musician could sell songs to publisher.
- Administrator could block any kind of users for a certain time, in this period, users cannot login.
- Administrator could delete any kind of use' account except administrators' account
- Administrator could check and cancel the transaction between musician and publisher.
- General User could listen to a song.
- General User could create/edit/like/delete a playlist.
- Musician could upload/edit/delete a song.
- Musician could accept or reject a transaction.
- Publisher could launch a transaction.
- Critic could make a highlighted comment and rating.
- Administrator could edit/delete a song.
- Administrator could block/delete an account.
- Administrator could cancel a transaction.
- A song can be contained in 0 or several playlist.
- A song can be contained in 1 or several genres.
- A song could have 0 or many comments, ratings, and highlighted comments and ratings.
- A playlist can contain 0 or lots of songs.
- A playlist could have 0 or many comments, ratings, and highlighted comments and ratings.
- A genre can contain lots of songs.
- A song has a copyright.
- A transaction can change the copyright of a song.
- A song can be in a Transaction.
- An account can have lots of playlist.
- An account can have many followers, and follow many accounts.
- A playlist can have many followers.