(Highly) regarded headphones for gaming are AKG K601, K701, K702, Q701; Audio-Technica ATH-AD700X, AD900X, AD2000X; Beyerdynamic DT770, DT880, DT990, Tesla T1; Philips Fidelio X2; Sennheiser HD558, HD598, HD650, HD700, HD800.
These are mostly open-back because soundstage and imaging are my top priorities when looking for headphones for gaming, so I only know about a few closed-back ones.
How good they are for music, you'll have to find out for yourself as I seldom listen to music with the headphones I bought for gaming (AD700X, Fidelio X, Q701, DT990). I personally recommend Q701; it has a wide and deep soundstage, accurate imaging, and excellent detailing.