Earphone problem

Is there anyway I can get both earphones to play the EXACT same thing and at the same volume?

For instance when I listen to Closer To The Heart by Rush, everything comes though on both earphones, bar from the drum track in the right ear. So I'm only hearing drums in the left ear. Another example is Pulse Of The Maggots by Slipknot, the guitar solo only comes in on one ear, then on the next solo, it swaps ear. Can't I just make both earphones do the full audio?

Thanks in advance,