The 534MB download packs three tunes ("Paralyzer" by Finger Eleven, "Picture to Burn" by Taylor Swift, "Walking on Sunshine" by Katrina and the Waves) and lets players act as singer, guitarist, bassist or drummer, depending on their stock of plastic instruments.
It joins the recent Guitar Hero 5 demo that also features three tunes: "A-Punk" by Vampire Weekend, "Kryptonite" by 3 Doors Down, and "The Rock Show" by Blink-182. Both demos are currently limited to Gold members--Guitar Hero 5's should be available to everyone else tomorrow (Oct. 16), with Band Hero's following in a week (Oct. 22).
Band Hero hits PlayStation 2, PlayStation 3, Xbox 360, Wii and Nintendo DS on November 3. Guitar Hero 5 hit all of those platforms, except Nintendo DS, in September.