This ZIP file contains four songs, at least one of which is most likely from the (in?)famous ZX Spectrum adaptation of Doom.
The songs are composed by two ZX Spectrum demoscene composers by the names of Joe and Sauron (the links point to their zxtunes.com pages, where you can listen to more of their work).
To rip these to MP3, I had to go kind of roundabout: since my computer mysteriously lacks a Stereo Mix setting (something about my motherboard, I think?), I had to install Vortex Tracker II (it plays the PT2 and ASC files that can be downloaded from zxtunes.com; you can also listen to them directly on the site) on my netbook and plug it in with an end-to-end 3.5mm audio cable from the netbook's headphone port to my computer's microphone port.
The songs _should_ loop decently; you might want to take them into an audio editor and make sure of that (and for best results save them as OGG or FLAC for that).
Oh, and for those who don't believe me that there is a ZX Spectrum version of Doom...
Spoiler: