to the Wii, had started work on the karaoke title Sing Hero before Activision cancelled its development. Dance Hero was also said to have been in development as of 2011. Dave Mustaine, frontman for Megadeth, stated he had been in talks with Activision and Neversoft for a Guitar Hero-related product. It was later revealed that Mustaine was working with Activision for music in Guitar Hero: Warriors of Rock, including an original track ("Sudden Death") recorded specifically for the game. Two Guitar Hero products that were announced but never released were a Red Hot Chili Peppers-themed title and a PlayStation Portable title that would have featured a drum component. Gameplay The core gameplay of the Guitar Hero games is a rhythm video game similar to Konami's Guitar Freaks and to a lesser extent Harmonix's previous music games such as Frequency and Amplitude. The guitar controller is recommended for play, although a standard console controller can be used instead. However, the guitar controller has been required for play ever since the inclusion of drum and vocal parts in the series. The game supports toggling the handedness of the guitar, allowing both left-handed and right-handed players to utilize the guitar controller. While playing the game, an extended guitar neck is shown vertically on the screen (the frets horizontal), often called the "note highway", and as the song progresses, colored markers or "gems" indicating notes travel down the screen in time with the music; the note colors and positions match those of the five fret keys on the guitar controller. Once the note(s) reach the bottom, the player must play the indicated note(s) by holding down the correct fret button(s) and hitting the strumming bar in order to score points. Success or failure will cause the on-screen Rock Meter to change, gauging the current health of the performance (denoted by red, yellow, and green sections). Should the Rock Meter drop below the red section, the song will automatically end, with the player booed off the stage by the audience. Successful note hits will add to the player's score, and by hitting a long series of consecutive successful note hits, the player can increase their score multiplier. There is a window of time for hitting each note, similar to other rhythm games such as Dance Dance Revolution, but unlike these games, scoring in Guitar Hero is not affected by accuracy; as long as the note