For neophytes: the types of microphones being talked about here are what you want for that 'dirty', 'amplified' Chicago blues sound - as opposed to a rural (e.g. Sonny Terry) blues, bluegrass, or Country sound, for which you would want a vocal mike such as the Shure 157 - or is it 571 - or 517 - or 751 - or 175 - or ... ?