I've always played punk style bass. Not the super simple stuff a la Ramones, but the more melodic bass such as Damned, Buzzcocks, Rancid, Stiff Little Fingers. I feel like Ive hit a wall as far as progression so I thought learning a different style would help break me through it. I'm really debating between picking up a jazz or a blues bass book. I'm still going to be playing the same style in bands, so which would help me more- jazz or blues bass?