I grew up playing in arcades with background music playing ... no way to tell stereo from mono over the EM bells and chimes but it didn't matter.
I became a fan of AC/DC playing it in fairly noisy environment and didn't appreciate the how great it can sound until I bought one. I really enjoy the music at first but found I couldn't play my stereo system because they compete. Now I've turn down the sound to a minimum so I can listen to whatever I am in the mood for ... in stereo on a stereo.
For me pin music being stereo really doesn't matter.