BlackBerry users can , allowing them to wirelessly browse, search and buy tracks from 7digital.com's catalogue of over 7m MP3s.
Songs can be searched by artist, title or tags and can be previewed before being purchased.
The tracks are instantly delivered to the user's phone over a cellular connection (GPRS, Edge or 3G) in a lower bit-rate format, which enables faster downloading.
Once the user connects to a Wi-Fi network, the application automatically upgrades the track to a high-quality MP3.
Users can listen to their purchased tracks via an advanced media player integrated into the application.
The media player also includes built-in support for stereo Bluetooth streaming.
Tyler Lessard, vice president of global alliances and developer relations at Research In Motion, BlackBerry's owner, said: "We're excited to see 7digital embrace the BlackBerry platform and help developers bring this unique and powerful music service to BlackBerry customers."
The application has been created in partnership with DevelopIQ using 7digital's API.
Ben Drury, CEO of 7digital, said: "We're excited to be bringing high-quality MP3 over-the-air downloads to the BlackBerry platform.
"This application demonstrates exactly why we developed our API, to allow third party developers to integrate digital music download functionality into their product offerings.
"The ability to buy tracks and albums on the move, or on impulse, is what the consumer wants."
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