Creating Music on a Mac?

Hello everyone, i just got the ideer to create music, on my mac.

but when i just think about it i, know the program you need is hard to get? is that right?

and which program is best ?

I want to create "Dubstep"

can any help? Plz

Thx you!

HEY GUYS.. thx for replying so fast.!

Ye "Garageband" is okay but i cant figure out creating dubstep in it:S

know some tutorials??