What are some alternatives?
When comparing Rocksmith and Osu, you can also consider the following products
Frets on Fire - Bonus content.
Clone Hero - Clone Hero is a free rhythm game, which can be played with any 5 or 6 button guitar controller...
StepMania - Rhythm game for Windows, Mac, and Linux.
Audiosurf - Audiosurf is a music-adapting puzzle racer where you use your own music to create your own experience.
VOEZ - VOEZ invites you to embark on the remarkable journey of teenage dreams
Guitar Hero Live - Guitar Hero Live is a Single and Multiplayer, Rhythm and Music video game created by FreeStyleGames and published by Activision.