Apple has published a Knowledge Base document for musicians wishing to make their music available through iTunes Music Store.

The move confirms that Apple is opening up its service to content from independent labels.

Apple is not negotiating offering the same deal to each company, regardless of artist roster.

Ninety per cent of sales are one-click downloads, meaning credit-card information is stored on Apple's servers. Apple licenses the one-click technology from Amazon.

Apple sold over 3.5 million tracks in its first month of operating its Music Store, with half the tracks sold purchased as parts of whole albums.

Musicians and independent labels are requested to email Apple at: [email protected]