The Rock Band Network (abbreviated RBN) was a downloadable content service designed by Harmonix with the help of Microsoft to allow musical artists and record labels to make their music available as playable tracks for the Rock Band series of rhythm video games, starting with Rock Band 2. It was designed to allow more music to be incorporated into Rock Band than Harmonix themselves could produce for the games, and it was seen as a way to further expand the games' music catalog into a wide variety of genres. The Network started closed beta testing in July 2009. The Rock Band Network Store was publicly available on March 4, 2010 for all Xbox 360 players in selected countries (US, Canada, UK, France, Italy, Germany, Spain, Sweden, and Singapore). Rock Band Network songs were exclusive to the