Support uploading MIDI files for download as a new top level schema

[RustoMCSpit]

Issue on Studiorack:
studiorack/studiorack-site#36

Resources:
https://github.com/ldrolez/free-midi-chords
https://www.hooktheory.com/theorytab

While I wasn't envisioning uploading tablature, that would be possible as well. It's a Studiorack / Owlplug suggestion mainly but having the capabilities of Hookpad but FOSS would be incredible. Total feature creep though.

There are some things to note around metadata and uploaded file standards which I have detailed below.

[RustoMCSpit]

Allow the uploader to pick a mode. So if you write 'Mode: dorian', you avoid having to force it into ionian or aeolian to upload it. Also having a scale list, e.g., blues / pentatonic / etc. (like the license list) would be good.

You might be tempted to add a key metadata entry but that’s wrong entirely. Every melody and chord progression can just be quickly shifted up to any key with arrow keys. Having 12 chord progressions that are the exact same but just modulated would be silly.

The only thing the user needs to know is the mode; the key should always be a parallel key to C major (C ionian, D dorian, E phygrian, F lydian, G mixolydian, A aeolian, B locrian) as C major is a standard for these types of things.

The user then can search for a specific mode and can pitch shift it themselves. We can also just have a tool to pitch shift it for them but this is basic theory.

For any harmony, just make the user name the file after its Roman numerals instead e.g. iii VIb i II.

This has limits: what about modal interchange, non 12-tet, key shifts, etc.? These are niche and should be thought about later.

EDIT: Key metadata makes sense for songs and MIDI files with multiple tracks at different keys. Key metadata does not make sense for basic melodies or chord loops not from a specific song.

[RustoMCSpit]

All MIDI file uploaders (as well as projects) might have to sign a Contributor License Agreement (CLA) or something similar if they wish to upload content. This ensures that they have the rights to share it, and if they do not, they must provide proper attribution to the rights holders.

Again, it is legal to upload sheet music and MIDI files of songs that aren't yours, such as those from HookTheory.com (https://www.hooktheory.com/theorytab), as long as you give appropriate credit to the owners.
This practice respects copyright laws while allowing for legitimate use of others' work.

[RustoMCSpit]

all midi file uploaders (as well as projects) will have to sign a CLA or something saying they have rights to upload this and if they dont they must credit the rights holders. again, it is legal to upload sheet music and midi files of songs that arent yours such as https://www.hooktheory.com/theorytab as long as you credit the owners

this would require some sort of artist tag? would that just be the author tag? that tag is used right now for the creator of something but do we list that as the person who assembled the midi or the song? i think we need two more tags. one for who made the midi and one for who wrote it and one for who holds rights

[RustoMCSpit]

This would also require metadata around length, details about what stems are included (such as main melody, bass, drums, harmony, etc.), and a version tag too.

I can imagine one user uploading Midi for a song and another user uploading an improved version of that Midi file with better timing and additional tracks. The other user should be able to request the original
user to merge their additions into one unified file. This is already how the project schema functions as per my understanding.