Hellfire - MD2 Music Fix
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This patch corrects the tempo of the music in this game when played on Model 2 Genesis / Mega Drive systems.
You don't need this patch if you have a Model 1 or play on an emulator or FPGA system

Installation
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Just apply this to the US version of Hellfire, preferrably the nointro version.
This won't work on the Japanese version as the addresses are different
This will actually apply to the EU version of the ROM, but I don't have a PAL system to test this on, and I would imagine the tempo shift is actually fine for 50 Hz play. If someone gives it a shot, let me know what it does.

Notes:
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Credit goes to Eke-Eke over on the sega-16 forums for figuring this stuff out. 
I was unable to download his original patch due to not being able to get an account over there, but was able to make it myself based on his description, so credit where credit is due.
Check out the discussion here: https://www.sega-16.com/forum/showthread.php?27955-Hellfire-sounds-slow-on-my-Model-2

I originally heard about this game from Shmup Junkie, and he mentioned the issue, and history. He alluded to a patch, so I searched around and eventually found that forum, with more details on the use of the busy flag on the Z80
Mostly I just wanted to make sure this was available in more places so that more people could enjoy the audio of the Genesis version