The Telegraph published an interesting article one how itunes has changed the way customers consider music a,d purchase accordingly tracks or complete albums. In summary, iTunes users mostly buy single songs from temporarily popular bands than the complete album, so they should be consider more like bees moving from one track to another, rather than collectors acquiring the complete album containing the current music hit.
This is the reason why AC/DC refused to have its album available on iTunes as they did not want to give customers/fans the choice of purchasing only couple of songs Indeed, the famous music band consider this album as an entire piece of art, so taking one song out of its entire context would be meaningless. Other majors or bands are using similar arguments to refuse offering new albums on iTunes, as it would "kill the album" by selling it into pieces
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