For a decent view across all types of genres I test headphones on my hifi and on my iPhone with the following tunes.
Massive Attack - Angels
Fleetwood Mac - Never Going Back Again & Rhiannon
Tracy Chapman - Behind The Wall
Angus & Julia Stone - Big Jet Plane
Mason - Exceeder
X-Press 2 - Kill 100 (Carl Craig Remix)
The above gives very deep bass, punchy bass, electronic instruments, ambiance, voice, detail, no instruments and harmony.
I usually throw in a couple of at-the-time favourites too, at the moment that is:
Africanism - Chocolate (Ben Delay Dub Remix)
Patrick Topping - Forget (Original Mix)