Answer:
well it depends on your audiance you are trying to impress and entertain. also what your abilities are as a player. typically in a talent show setting you have a number of things that can hinder your performance. the major ones include a sound system of poor quality, a room that has poor accoustics (usually a gymnasium or simmilar type of room) and a short time to perform. there really isn't alot you can do about these issues except be prepaired. so pick something that is simple to perform, has powerfull lyrics, and is within your playing abilities.