For some people the most annoying factor when buying music online is that it often comes with some form of Digital Rights Management (DRM) which can restrict what people do with the music. The biggest downside to this is that material downloaded for one MP3 player may have to be re-purchased if you buy a different portable music player so that you can copy the tracks onto it again.
To this end Warner Music has agreed a deal with 7digital.com which means music you purchase in the UK, Ireland, Spain, France and Germany from the website will not have DRM embedded with it. This increases the number of devices tracks will be playable on too since not all music playback devices support DRM enabled material and may possibly encourage more people to download a paid for track rather than ripping it from a friends CD or downloading it via the Internet.
7digital.com also offers material from EMI and is apparently in discussions with Sony BMG and Univeral according to the BBC News Online item. Tracks cost 79p each, but this reduces when buying a complete album, for example, The Young Knives Superabundance album with 12 tracks plus interview costs £7.49. The site also have a number of free music and video clips that can be downloaded.