BlackBerry users can now download music tracks from seven million MP3s from 7Digital.

The DRM-free service allows BlackBerry users to download lower bit-rate tracks on the move which are then updated to high-quality 320kbps MP3 automatically, in the background, when a faster Wi-Fi connection becomes available.

It also includes built-in support for stereo Bluetooth streaming, allowing users to play music wirelessly at home and in the car.

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The free 7digital application can be downloaded from BlackBerry App World and 7digital's dedicated web page.

Currently the application supports the BlackBerry Bold, BlackBerry Curve 8900, BlackBerry Tour, BlackBerry Curve 8520 and BlackBerry Storm smartphones.

The 7digital BlackBerry application has been created in partnership with DevelopIQ.

7digital also announced the launch of a US store, which hopes to compete with iTunes and others, including content from Universal Music Group , Warner, EMI, Sony and leading independent labels.

7digital point out, MP3 downloads from its service are compatible with any music player including iPods, iPhones, BlackBerries, MP3 players and mobile phones and can be legally copied between multiple devices.

The majority of single tracks cost $0.77 (48P), the majority of albums $7.77 (£4.88).

Recently, HMV Group purchased a 50 percent stake in 7digital to help accelerate the growth of both companies, and 7digital is now HMV Group's single supplier for all existing digital operations.

Both the UK and US 7digital sites offer a range of free MP3 downloads including Howling Bells, The Temper Trap, Part Chimp, Tiger Lillies and ...And You Will Know Us By The Trail Of Dead.

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See also: 7digital claims broadest reach of any MP3 store