Artistic performance? You can submit any type of art, there are some peeps that submit their singing and music composition before. I believe you can do theatre, dance, etc.
Yeah until they have not violated any rules it's completely fine to submit any entry as this is competition open to all and if you have those skills you can take part in it.I have seen people submitting funny one's also just to take part.
Yes music entries are also accepted like creating some roo songs but till now no acting or dance like art have been presented in these competitions but presenting it to the team in unique and creative way could also win you the prize.Creativity has no limits.