1. 

What TV show did Adam Levine and Blake Shelton first become friends on?

2. 

Demi Lovato and Christina Aguilera collaborated on which track...?

3. 

Lady Gaga collaborated with Ariana Grande on which track...?

4. 

What's Adam Levine and Blake Shelton's 'ship' name?

5. 

How many collaborations have Ed Sheeran and Taylor Swift released?

6. 

What year did Elton John first meet Eminem?

7. 

Ellie Goulding was the opening act for the North American leg of which Katy Perry tour...?