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