Finally, I finished my WebOS, or did I? I want to continue working on it as WebOS 2. I’m quite proud of how it looks now. But anyway, here’s the Readme:

PianoOSA WebOS, which has notepad and metronome apps and fully playable 88 key piano. 
Try it here :https://raw.githack.com/Korsor2137/PianoOS/main/index.html
Note: it may take a few seconds to prepare all the piano sounds
How to run: Yeah, just click the link. Or download it and then run index.html
Features:
-Full 88 key virtual piano, which you can play using mouse, with your pc keyboard (-a- to -’- keys, press capslock to change octaves to lower) or by connecting your own MIDI piano;
-Keys glow when you play the piano;
-A simple notepad and a metronome which when you minimalize will remember their location adn when they’re closed, their position resets;
-A button to hide the piano interface;
-Volume settings which you can change to your liking.

Author’s notes:
And why did I decide to make this? Well, I saw how on the WebOS missions there was a lot of awesome stuff, the same main concept and yet they were all so different. So, since I like piano, decided to implement it :D
I plan on making it more customizable in the future, such as changing the background color, or maybe the whole stylistic, making the top right buttons actually work instead of just being a decoration, adding maybe a few piano sounds, and of course more apps so it actually feels like an actual OS. Also, notice a little reference at the title screen?

Full copyright of the sound samples I used:
MIT LicenseCopyright (c) 2020 Liam LeePermission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the “Software”), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.