This question is based on using an understanding of the Porter theory. Please start a discussion on the question "how effective in your judgement is the Porters Five Forces model (Porter 1979) in evaluating and appraising the competitive nature of the on line music industry and using the theory what can you identify as the pressures and impacts acting on this sector"? Think about making an evaluative argument as part of your response.
Look at the "E" in a STEP context by looking at the economic perspective. Economics is basically the goods and services we want (demand) and how effectively they are met (supply). See if you can work this into your discussion, and try using your understanding of how key economic factors which are in the news impact on business behaviours.