Depends on specifics, but I tend to use one of a few:

Surefire EP4 is my primary, although sometimes a bit too muffled (unless I'm allll the way up next to the speakers =D)

Rooth C&P, specifically the M-Fit Concert/Party, have some great fidelity coming through. Sadly not quite sure where to find them other than through Drop (formerly MassDrop)

Advanced Eartune Live U Hi-Fidelity is new to me, just ordered them, but they look promising. Have a good sound curve (see website), and hopefully similar fidelity to the Rooth and as good or better dB reduction.