In pursuit of the golden ear.

Just how do you train yourself to attain that golden ear? How do you tell if the highs are extended, mids are warm, base with authority, musical, colorations, etc, etc? In order for you to make a judgment call, you must have a base to compare to. Logic tells me that best gauge to use is live music, vocals or instruments. But I believe that most of us are not train musicians nor do we have time to attend concert halls. Whatever bases we have comes typically from our audio equipment evolutio or from other folks' setup.

Please enlighten me on your golden ear secrets; I would like to move up from my copper ear to that elusive golden ear. Thanks.