Do you have to be “in the mood?”

Do you have to be in the mood to enjoy the music on your stereo, or does your stereo put you in the mood?  I find that if I put on my set just because I want to enjoy the sound coming out, I seldom have a very good outcome.  That expensive big beautiful rig over there invites you to play it.  But, playing it just for kicks doesn’t do it for me. I have to be really receptive to what I’m playing on it, otherwise I’m prone to all sorts of imagined defects. 
 Music reproduction is not an exact science.  There must be a “suspension of disbelief” in the realness  of the sound produced for me  to enjoy it,  much as we overlook the  implausible incongruities in movie plots so that we can enjoy a film.   I must be involved in the music itself to  appreciate  the sound and really enjoy my rig.
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not "be in the mood" so much as have the time to devote to at least a couple of hours. I can listen casually through the car or a home Deep Blue 2 bluetooth speaker. Like Elizabeth, I listen many hours a day, just not all of my listening on my primary rig.
I remember the days of purchasing and trading up for a better receiver; my humble beginnings.  With the passing of time, my gear is much better and the sound more refined.  I listen to vinyl, CD, and a tube tuner (MR-67) in no particular order.  I enjoy both the tactile and listening feeling my system provides and therefore, "It" puts me in a good mood/place; always.  I have enough to critically analyze; I rather enjoy my gear instead.

Both!  Mood certainly effects the listening experience.

If you are in a bad mood your system will start out sounding bad, but sometimes the mood changes as you play music.

Also sometimes the system has to warm up, and that may take a couple of albums for your music to smooth out.

I like long listening periods (hours) to really get into the sound.
Most times I’m not in the mood and it comes down to Netflix or the stereo. If I go the music route, the rig sounds so good that I get in the mood. I’m done when it’s past my bedtime and I’m muttering to myself about how awesome something sounds.