i have a keyboard/paino thing with a MIDI output and input connection port, and i want to start using REASON music making program on my mac with that keyboard, and im going to be getting a MIDI cable to connect the two, but i want to know if there is a specific one i should get? should it connect into a USB port on my computer? or the firewire port? i just want to know so i dont wast e my money on the wrong one 
thanks
thanks