Tell who is your favourite singer. then what quality in that person's singing u like. what's the best thing of that singer. Elaborate all these points and include some more related points and write it yourself.
Actually I personally think that literature comes from your thoughts, your mind. It is literature. And when you have to write about your choice than you should enjoy it. Trust me, copying anyone's thoughts doesn't give a fun, like which comes from your mind, when you write your thoughts. 
First, confirm which singer is your favorite, then write about him. Your favorite song and things like that. It would become a great adventure to you. Try it !