Premise: The AIR Charts are the official sales charts for Australian independent music released by Australian owned, independent record labels. Presented by AIR, the Australian Independent Record Labels Association, the charts are calculated according to official sales figures provided by the ARIA Charts, which includes legal MP3 download sales.
Hypothesis: Presented by AIR, the Australian Independent Record Labels Association, the charts are calculated according to official sales figures provided by the ARIA Charts, which includes legal MP3 download sales. Illegal downloads are used for legal prosecutions but not popularity.