I am doing my ISU for grade 12 Data Management on the relationships between the sales and usages of different types of audio and video technologies such as CDs, DVDs, mp3 players and iPods, P2P file sharing networks like LimeWire, mp3 and video cellphones, etc. I am looking for stats on how often different demographics use or purchase these technologies. So far I have had little luck locating raw data on this subject and I was hoping someone could point me in the right direction.