So, yeah, I have a cheap “home studio”, therefore, I like to discover unheard details with new equipment. 
This is a thread for tracks you use to find if your headphones are “detail monsters”.
Tracks with a tiny hiss you can’t hear with all your headphones.
Tracks that made you say “what was that” ?
Tracks so full of little details you re-discover every time you play it.
This one basically fits all the categories:
For this one… is someone coughing at 4:30?
How about every track. On every album. Pink Floyd.
I really should listen to Pink Floyd more. Good idea!
Going to suggest some plunderphonics:
Can you hear the faint static caused by the kick drum at about 2:15? It’s mostly in the right channel. At first I thought it was my new headphones, but I found it using two other sets of cans. I’ve found a lot of these little not-quite-flaws since getting into this hobby.
EDIT: I couldn’t hear it on the YouTube version, but could on my FLAC copy. Hmmmmm… That’s interesting in and of itself!
Damn youtube, getting rid of all the… imperfections! 
Man, imagine listening to this song on an AM or FM radio, going home, buying it or finding it on youtube, and realizing it’s like 5 songs in one.
I can’t do Amy Winehouse anymore. There are way too many ticks and clicks on her recordings. I don’t know if some idiot in the recording studio was trying to simulate a record or what but…it sounds terrible. Maybe I have go out and get some Beats or Bose so my music sounds better 
Oh well.
The bass drum pedal in Since I’ve Been Loving You. My dad used the same pedal and it is solid nostalgia for me. I never hear it until I picked up the recent vinyl release of Zeppelin II…now I can’t not hear it!
Also, I love listening to all the weird little conversations in the Orb’s tunes
You can hear the Trinity church heating system in the background on…