bluetooth headset question

I have a Blackberry tour. I'm working out at the gym with a friend. If I bought a bluetooth headset would that work with the regular (included) earphones plugged in so we could both listen to music? Or would 2 bluetooth headsets work at the same time?

Bump!

Is this possibly in the wrong section?

i believe once a device is plugged into the the earphone jack of the phone you loose bluetooth headset sound.

i may be wrong though.