Can I submit an amateur music sample to Brown?

I’ve played guitar recreationally for a few years now, and this has figured prominently in my application. However, Brown asks for “a description of music theory training and/or ensemble experience, the composer, title of the work and movement title or opus number.” I would be submitting an original song, sooooo I can’t provide an answer to these. Should I omit this from my app?

Late reply, but I would assume that you just would put yourself as the composer, write your song title as the title of the work and n/a for the movement title