I was on a Mac, so I only tried the command-line tools, which I could build OK but none of them handled ID1.PAK. Someone I know on IRC authored a tool and uploaded it for me to https://github.com/E-werd/PakTool which worked. But I had to fire up a Windows VM to run it, CBA to get mono set up on the Mac beyond installing it.
Sorry for broken link, it's actually
http://jmtd.net/tmp/sound.zip
edit
A) Quake isn't freeware at all. There's a 1-episode shareware version, which is software rendering only and afaik a DOS executable, and that's it. The commercial game is still being sold actively. The engine source code has been released, and you can get many community-built, free engines, but you still need game data to play it.
But sadly, B), none of the places selling Quake nowadays (e.g. Steam) include the soundtrack. So you have to either buy a 2nd hand copy of the original CD release, or pirate (at least) the soundtrack.