I'm a jazz guy who has an appreciation of early fusion and think one of the great fusion jazz albums of all time is Herbie Hancock's Head Hunters.  It's a good workout for any headphones.  If you're listening digitally, make sure the recording is lossless. 

Thanks for your observations.    Now that I've had several more days to sample and compare, my opinion is pretty much the same.  Although most of my listening has been via my phone and Pandora, I'm still most comfortable with the Senn 585s.  The Grado 80is and Sony V6s are both more exciting...

I've recently bought four well regarded headphones, all used and in excellent condition.  They are Sennheiser HD 280, Grado SR 80i, Sony V-6, and -- the latest to arrive today -- Sennheiser HD 595.  Cost ranged from $50 for the HD 280 (via Craigslist) to $100 including shipping for the HD 595. ...