Condensor mics excell on acoustic sources like acoustic guitars, voice, drum overheads, etc because they're so much more accurate. Unlike a dynamic type microphones that have to deal with the greater mass of moving a coil that's attached to the diaphram, they can react to subtle changes in sound preasure much more quikly, being a capacitor.Not to say they don't work well on other stuff, I use condensors on guitar cabinets, bass cabinets and kick drums all the time and work very well in that application.