Looking for a certain type of media player...
 

...which lets me select a part of a track to be repeated in an endless loop.
Yeah, technically this might be the wrong forum, but as it is some kind of request I guessed I might just ask here anyway.
I guess Quicktime Pro can do it. But Quicktime Pro costs money (or is illegal...) which isn't THAT much of a problem, but I'd want a freeware player first before considering something else.

I would just cut up the track with Audacity, and then set that on loop in Winamp...but not just cut the track.

Yeah that would do it, but still I know it's possible to do it with a player software, which lets me do this on the fly without cutting and saving the track to a diffrent file...

iTunes can.