Go to this page (
http://www.foobar2000.org/components/view/foo_input_usf) and download it to your foobar components folder within its directory. Unzip it and you should be good to go. Then you can convert the USFs to MP3 yourself if you want to at whatever quality setting you desire by downloading one of these compiles of the MP3 encoder LAME (
http://www.rarewares.org/mp3-lame-bundle.php) appropriate for your operating system. Then unzip it and when you select the Zelda tracks in foobar, you can right click and select "Convert > ..." Tell it MP3 and when it opens the box, select the lame.exe file that came out of the ZIP. After that, you'll never have to point it to LAME again and MP3 converting will be effortless.
This will also open you up to being able to download and listen to the whole lot of other soundtracks in USF format and there are similar plugins on the foobar components page for other formats that work similarly and take up almost no disk space. There are formats for NES, SNES, Playstation, PS2, Sega Mega Drive/Genesis, Game Gear, Game Boy, Game Boy Advance, DS, and even more systems. You can find files on zophar.net/music (
http://www.zophar.net/music.html), same as where you got Ocarina of Time. Trust me, it's for your own good that you do this instead of me or someone else just posting converted MP3s. You can get all kinds of stuff that's never had CD releases or incomplete or sub-par ones.