3 tables: Artist, Album and Song. The rules are:
- Each album must have 1 or more songs.
- Each song can only appear in 1 album.
- Each song can be performed by 1 or more artists
- Each album can contain songs from different artists.
- Each album can contain songs performed by 2 or more artists.
Draw the ER diagram. Write a SQL query to find all albums that feature more than 1 artist.