Hi Jema — yes, to play the music and also the videos you want to capture. The 1st phone is to capture, the 2nd one is to play the content. This is of course a “hack” for the more creative minds who would like to try cool ideas for 360 videos. Nevertheless, since it’s easy to make — and access to a 2nd phone is something not to difficult to get — we wanted to encourage the community to make collages.
Have you made one? :)