So I've been using DeaDBeeF as my audio player in Linux with much delight, and I've gotten somewhat of a kick out of watching spectrograms. So here's one I just saw (done up nice in sox):

 
Is there some kind of commonly used shaping that manifests itself like this, or is this something else entirely?
 
I also see the following kind of spec more frequently, with a much tighter signal around 16k:

 
Bonus points to whoever guesses the tracks.

I do not think it is noise shaping, and that would have a less narrow peak at a higher frequency. It is most likely to be some kind of interference. For example, a 15.6-15.7 kHz signal may come from the PAL/NTSC horizontal frequency of an old analog CRT television or monitor (younger people can often hear this near such devices as an annoying high pitched tone). It would be easier to analyze if you uploaded a short section of the sample as a WAV or FLAC file.

stv014 said:

  I do not think it is noise shaping, and that would have a less narrow peak at a higher frequency. It is most likely to be some kind of interference. For example, a 15.6-15.7 kHz signal may come from the PAL/NTSC horizontal frequency of an old analog CRT television or monitor (younger people can often hear this near such devices as an annoying high pitched tone). It would be easier to analyze if you uploaded a short section of the sample as a WAV or FLAC file.

Click to expand...

 
Sure, here's the first 30sec. Thanks for the sleuthing!
https://drive.google.com/file/d/0BwmVtb5IwniEWXB6ajQ3VVY2V28/view?usp=sharing

At a higher frequency resolution, the noise looks more like a number of tones, but I do not know what it exactly is (other than it being probably some sort of interference in the recording). It seems to be pairs of tones about 25 Hz apart, which may or may not mean it is related to PAL TVs or some other "noisy" equipment.
  
The second graph shows only the lowest frequency tone with even more zoom. As its frequency is ~15624.5 Hz, it is very close to the PAL horizontal frequency (15625 Hz), so it is indeed most likely to be from an old CRT.
 
Edit: looking again at the first graph from the OP, it appears as if the higher frequency tone pairs have slightly varying pitch over time (or their levels change, but the pitch does not), while the 15625 Hz one is stable. All the interference also disappears for some periods of time, so perhaps it is from a single device that was not always active.

Interesting. I did notice that some of the tones shifted over time, so I thought perhaps it was some correlation to the music, but it seems like equipment is the probable cause. The liner notes for the CD seem innocuous enough, and no mention is made of any mad requirements the composer had for high frequency tones (though he's certainly of the ilk that would ask for such things This of course means now I have to loop over my entire music collection to find other examples. Thanks again!