[sinphase]

as the title says. 

 

[Ishcabible]

Beyerdynamics DT48 brings out the vocals almost to a fault. They're awesome for anything that's mainly vocals.

 

[Uncle Erik]

X2 on the DT48. Nothing touches it for the price - find a used one. You'll also get recommendations for Stax and various kilobuck headphones, but a used DT48 delivers for $75-$150 (depending on age and condition). The only other inexpensive rival is the AKG K-501 which goes for $100-$150. Great headphones and they have the soundstage the DT48 lacks, but you don't get the same level of transparency.

Also, the DT48 covers piano very, very well.