Can someone maybe give me like a breif overveiw of what diff. pick-ups do what. Such as my guitar it has dual seymour duncan humbuckers what are those pick-ups good for classic rock, metal or what?and could maybe someone recomend better pick-ups for classic rock if there is any. Not sure what mine are but it's a washburn x-50 pro(http://www.washburn.com/electrics/x/x50pro.htm). Thanx