Brahms
Brahms is a command line utility written in Go that quickly generates good-looking visuals of midi-files.
It is inspired by Off the staff by Nicholas Rougeux.
Feel free to open PRs, issues, etc. I'm glad to help.
Example
Below you can see an example of Beethoven's Symphony Nr. 9 (at least i think so, I can't remember exactly 🤷):

Generated some other nice visualisation? Share it here with the world in the project's showcase.
Installation
Prerequisites
Please ensure that you have installed midicsv and made it available in your PATH
variable so you can call it directly from the command-line.
You can test your midicsv installation by calling midicsv -u
in your console. The expected output has to be similar to this:
Usage: Your\Path\Where\It\Is\Midicsv.exe [ options ] [ midi_file ] [ csv_file ]
Options:
-u Print this message
-v Verbose: dump header and track information
Version 1.1 (January 2008)
go install github.com/Wulfheart/brahms
Windows
- Download the latest
.exe
release here.
- Add the downloaded executable to your
PATH
variable.
Usage
NAME:
brahms - visualize your music
USAGE:
brahms -i path/to/midi [global options]
VERSION:
v0.1.0
GLOBAL OPTIONS:
--in infile, -i infile infile
--out outfile, -o outfile outfile
--colors hex, -c hex case-insensitive comma-separated string of hexcolors, e.g. '#40e0d0,#ff8c00,#ff0080'
--fill-opacity value (default: 0.5)
--help, -h show help (default: false)
--version, -v print the version (default: false)
Tips
For nice gradients look at https://uigradients.com/ or at https://webgradients.com/.