What are some alternatives?
When comparing Clone Hero and Osu, you can also consider the following products
StepMania - Rhythm game for Windows, Mac, and Linux.
Frets on Fire - Bonus content.
Rocksmith - Rocksmith builds off of the fundamentals of music games like Rock Band and Guitar Hero by offering fundamental lessons in actually playing guitar.
VOEZ - VOEZ invites you to embark on the remarkable journey of teenage dreams
Audiosurf - Audiosurf is a music-adapting puzzle racer where you use your own music to create your own experience.
FoFiX - A free Guitar Hero/RockBand-like game MOD, forked from ...