I listened, but it was hard to tell much from your posted file.

Usually, awful-sounding noises turn out to be external problems, assuming no major knocking or banging from the lower part of the engine, so don't work yourself into a sweat just yet.

First off: fluids all OK? Enough oil in the crankcase, and coolant in the rad/expansion tank? Color of each look OK?

Next: Any other symptoms accompanying the noise - like loss of power, stumbling, missing, poor acceleration, hard starting? Report all!

Any electrical quirks cropping up lately? When you turn the ignition key to the 'run' position, do ALL the idiot lights light up? In particular, the oil pressure and alternator lights?

If the easy stuff checks out OK, then move to the stuff that takes maybe 5-10 minutes to check out. Pop the distributor cap and pull the rotor. Are the contacts in the cap looking OK? Is the rotor looking OK? A little bit of carbon on the rotor tip from arcing is normal, but does it look overheated or melted?

Next, pull the plugs. They should all look about the same, hopefully neither covered in oil, fluffy black soot, or with baked-on whitish deposits.

If all those look OK, reinstall all and fire the engine up. In the light of day, you can see better as you listen - that can actually help. I would focus on the front of the engine and look for misaligned accessory drive belts; and those will likely make more noise as speed increases. I'd say the most common culprit is the alternator. If you have a timing light, hook it up and check the accessory drive pulleys for erratic motion, and also check the crank timing marks and the fan. The rubber in the harmonic damper (crank pulley) can crap out and leave you with erratic ignition timing, which can create all sorts of secondary effects which can cause the engine to run poorly or even result in odd noises. If the water pump bearing is shot, that can make some ominous noises and of course you'll see blade wobble or runout.

I'm suggesting you check all the basics and try to identify any other symptoms. Let us know what you find!