What are some alternatives?
When comparing StepMania and PaRappa the Rapper 2, you can also consider the following products
Frets on Fire - Bonus content.
Rock Band - Rock Band is a Rhythm Music and Single and Multiplayer video game created by Harmonix and published by MTV Games.
Osu - Osu is Music, Rhythm, Single and Multiplayer video game developed by Dean Herbert.
DJ Hero - DJ Hero is Music, Rhythm-based, Single and Multiplayer video game developed by FreeStyleGames and published by Activision.
Clone Hero - Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller...
SingStar Dance - SingStar Dance is a Dance, Music, Rhythm, Single and Multiplayer video game developed by SCE London Studio and published by Sony Computer Entertainment.