Create an outline of the major themes points about the music that you like and commit it to memory with a memorization trick, like an acronym. Don't try to remember the entire speech in detail like this; just remember the order of important points. Talk about the songs and singers/groups that you are familiar with. If you suddenly lose your train of thought or draw a complete blank, there are a few you can do to keep from panicking. 1. Pretend like you're pausing on purpose. Walk back and forth slowly, as if you're letting your last point sink in. You can appeal to the audience by saying, " How would YOU feel if you met your favourite singer?" 2. There is always a joker or popular person who will stand out in the crowd. Stare at someone like this and try to draw a response from him or her while you think. Say, " Some people may not find music a serious topic , but I do. How would you feel if suddenly you did not have music in your life?" 3. If you need more time to think, you may want to ask the audience a question. What are your favourite singers/groups? Have a few prepared ahead, like "Do you have any questions about my topic," or "Can everyone hear me at the back?" 4. If you still can't remember what to say, make up a reason to pause the speech. You can say, "I'm sorry, but my throat is very dry. Can I please get a glass of water?" Someone will go to get you a drink, and you will have time to think of two or three points to talk about. 5. At the end you could say say, Thanks for listening and remember , " Music soothes the savage beast in all of us".

Asking such a general and vague question like this isn't going to help you. If you know something about music, you can talk about it. If you know nothing, well you're lost.