Answer:
This is also a fun one to write. A girl (whatever name you want) is an aspiring singer but can't afford it and works in a store (whatever type of store you want)
Her favorite singer (and possibly a love interest if you want that aspect, you would also need to come up with a name for him/her) walks in on her break in the middle of her singing one of their songs and basically helps her achieve greatness and become a huge popstar. You will have to fill in some other small things but this is a good start. Also I would love to know what grade you got if you end up using this theme. Good luck!