I would like to get some more clarification on the video rule.
I'm currently working on a arrangement to participate, but since I'm a trumpet player I've been working on a 3 line composition to get in some chords to back up the song. Doing this on my own however means that I will be recording the audio of all 3 lines separately and mix them together under the video.

Which leaves me with the question if it would be good enough if I only record a video of me playing the first line? Or do I need to provide 3 videos in this case as well?