MDR-7506 : Absolutely recommended!

No wonder Sony have been making these headphones for 30 years and still going as the (pro) world loves them so much. I think there is no better buy at this price. The sound is very detailed with fantastic clarity, enabling you to hear each element of the music positioned exactly in the space around you. The frequency response is extremely linear. Deep and accurate bass, crisp mids, realistic highs. A practical result of all the above in my personal experience is that I can be confident of my decisions on the use of various sounds, their volumes and positioning in the mix. But I also love just listening to music with them.

On top of all that, they are lightweight as they should be and the pressure they apply on the head (around the ears) is ideal, so they can be worn for hours without causing discomfort. The passive (!) sound cancelling works wonders, secluding you completely from ambient sounds and adding to the clarity of the music.

If more people got to know these headphones, a great number of other models/manufacturers might go out of business - at least as far as those people who like realistic, studio-style sound are concerned...