They clearly had fun while making working on new music.

This image appears in the gallery:
32 Pictures You Might Have Missed This Week (7th December 2015)

1. 
2. 
3. 
4. 
5. 
6. 
7. 
8. 
9. 

10. 32 images

See the full gallery: 32 Pictures You Might Have Missed This Week (7th December 2015)