Often I see things denoted as the "PC music" when it doesn't sound like it does on DOSBox.
It's a little tricky on the PC because you have at least two OS's (DOS and Windows), and the DOS version supports at least two different audio technologies, Adlib and Tandy (the former is more common in most PCs at the time however). (Supposedly some version even has CD audio tracks on a CD-ROM, but so far I haven't been able to track down and verify such a claim.) Plus if you're talking about Youtube, I don't know how accurately people label things anyway.
For all I know even a remix can be labeled as "PC music" on Youtube, if someone took a remix from somewhere and then mislabeled it as PC music.
If it sounds MIDI-like then it's probably the Windows version, I guess? If you have the Youtube link I can have a listen and see if I can identify.
[edit: also, if it's the MIDI on Windows, technically it can sound different on different hardware, depending on the instrument samples the sound card uses for MIDI. Though any MIDI played back on modern PCs will typically sound the same, because modern sound cards no longer directly support MIDI, it's actually emulated in Windows nowadays]