What are your rules regarding this? We do AQA and the guidelines are quite vague. We have a lot of students wanting to do their own interpretation of a popular song, which, while it may be very good, is hard to mark as there's no written score or recording with which to compare it. It feels wrong to tell them they can't do it, when they're obviously showing musical talent, and playing from written notation (or TAB etc) might result in a performance that isn't as good, but I don't want to get it wrong! Any advice would be greatly appreciated.