I was making a rhythm game and thought that some people might've wanted to do the same! So, I made a customizable module to simplify the process, but allow developers to measure rhythm however they want.

Feature summary:

• Get accuracy data based on customizable tolerance levels
  • Lower Rating = More on-beat, but nil means the player completely missed
• An event (OnIdle) fires if no input is given and a key passed.

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You can get the module here:

https://www.roblox.com/library/6580760519/RhythmService

You can check out or contribute to the code in this repository!

Here's the documentation: https://github.com/Beastslash/Roblox-RhythmService/wiki/API-documentation

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If you have any questions, DM me on the DevForum or on my Twitter! I'll be happy to help.