That's a good point - I read it as a singer but obviously it could be a musician in which case a wrist corsage wouldn't be great for anyone. Maybe they leave it to you to say what the soloist is so you can design around it. In any case I expect the marking emphasis will be on interpretation of theme, techniques used and composition so don't get overly hung up on type of musician. Will you have enough time to do matching pieces?
Best of luck Jake - hope you get through so I can come and watch you at Tatton!