7digital and RIM are back in bed with news that the BlackBerry PlayBook will ship pre-installed with over 13 million high-quality (320kbps) MP3 tracks from the London-based media company. At launch, the deal affects the US and Canada only, with more countries promised in 2011. PlayBook users will be able to search and preview tracks before purchasing with a discovery assist provided by 7digital's music recommendation engine. The whole kit will be previewed this week at South by Southwest where we hope to get some hands-on time. Full press release after the break.