sentences:  The base version of the game includes 15 songs from both "Guitar Hero II" and "Guitar Hero III", and has released a three-song add-on pack every month since January 2008.The title has been downloaded by users one million times, with both Verizon and Hands-On Mobile claiming that over 250,000 songs are played a day on the platform.The two companies produced two other mobile-based "Guitar Hero" games; "Guitar Hero III