Change event in select using jquery

$('#gMonth2').on('change', function (e) {
           var monthSelected = $("option:selected", this);
           var valuemonthSelected = this.value;
      });

<select id="aioConceptName">
    <option>choose io</option>
    <option>roma</option>
    <option>totti</option>
</select>

var conceptName = $('#aioConceptName').find(":selected").text();
var conceptName = $('#aioConceptName').find(":selected").val();