Key represented as C-G ?

[ARNK]

I wish there was a beginner sub-category, but I thought I'd ask anyway.

Say you have a few MIDI files labeled by key.

MIDI_TEMPO_C.mid
MIDI_TEMPO_Cm.mid
MIDI_TEMPO_F.mid

Easy enough, understood.

But what would the following represent in terms of key?

MIDI_TEMPO_C-G.mid
MIDI_TEMPO_F#-Gb.mid

A hybrid of keys that work musically together? C & G, F# & Gb, etc.

Thanks in advance.

[Functional]

There's no way to tell without looking at the midi files. Maybe it's saying that first key is C which is modulated then to G. Maybe it's saying C chord which then goes to G chord. If it's the latter, then you have couple options for the key; it could be C or it could be G.

F#-Gb makes things even more confusing, because those two notes are enharmonic. If you're in the key of F#, then you're in the same key as Gb, because these two are enharmonic tones. Likewise, the chord F# is the same thing as the chord Gb. Kind of anyway.

So whatever midi files you have, there's no way to help you with those without being able to look at them.

[ARNK]

I appreciate you taking a look & giving it a shot! Can you view the attached photos clearly? I had to open each in a new tab. First is F#-Gb, second C-G.

[Gamma-UT]

The F#-Gb one is as Functional described: just enharmonic equivalents. It’s the only note in the file, just spread across octaves.

The C-G one has a misleading name as it uses the notes from just a C major chord - C, E and G - where you might expect it to be a C and G major chord, one after the other from the name.

[clipnotic]

I think the creator of that MIDI files chose that names to show in which scales that notes are working. The first MIDI file works in the scales F# and Gb, which is like the others also written enharmonic. And the second file works in the scales C and G. They would also work in some Minor scales, but like the notes placed in that MIDI files, the sequences are looking more "Major" and the possible chords in the C-G file are also Major chords.