 [ Symptoms ] what is a grade iii heart murmur  what is the difference between a grade three and a grade 2 murmur what would a grade 3 sound like with a stethoscope [ Disease ] a grade 3 murmur is just louder and easier to hear than a grade 2 the grade of a murmur is just a subjective comment on the intensity but not the quality of a murmur murmurs can be blowing whistling high pitched low pitched etc they can be systolic first heart sound or diastolic second heart sound murmurs are also judged by their location mid sternum precordium etc  and their ability to transmit being heard in other chest locations