Xbox 360 owners can enjoy the delightful combo of rock ‘n’ roll and high speed racing this fine Tuesday morning as demos for EA’s Need For Speed: ProStreet and (as mentioned yesterday) Activision’s Guitar Hero III have officially hit the Live Marketplace. The demos weigh in at 654.64 MB and 544.82 MB, respectively.

Read more: Top Gun Anthem Hitting Guitar Hero III As DLC This Week, Muse Returns To Guitar Hero In New DLC Pack On May 8, Activision: MTV Is “Painting A Very Misleading Picture”, Activision Announces Guitar Hero III Weekend, XBL Demo Hits Tomorrow, Guitar Hero III Intercope Track Pack Hits August 7