Pros:

1. It is a free app that offers different singing features
2. You can collaborate with a friend to make a song
3. It has free recording features that allow you to record as you sing
4. It has many voice enhancing features to allow users to create music of their choice
5. It is a community-based work that allows you to socialize with other music lovers
6. It has varieties of music and genre of countless types

Cons:
None I could see