Sounds like Ab min to me, in normal tuning.
Scale goes: A♭, B♭, C♭, D♭, E♭, F♭, and G♭
Playing it on mandolin, I get E♭ G♭ C♭ E♭ as the main 4-note theme, with guest appearances by A♭ and B♭.
(These notes have other names in different keys - i.e C♭ is also B natural)
If your mandola is CGDA scale like the picture below, then the 4-note theme would be played D-string 1st fret, D-string 4th fret, G-string 4th fret, D-string 1st fret.
It seems to harmonise with a Ab min chord (although there's something ghostly going on) which you can make a simple 3-note version of by holding down Eb on 3rd Fret of C-string, and Ab and Eb, first fret of two middle strings only.
Hard work if you're a beginner.
If it's actually an octave mandolin tuned GDAE ,which is sometimes described as a mandola, then move everything across to the left
https://i.imgur.com/HPIGnxy.png
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