[class^="gpt-"],
[class*=" gpt-"] {
  display: inline-block;
  width: 16px;
  height: 16px;
  margin-top: 1px;
  *margin-right: .3em;
  line-height: 16px;
  vertical-align: text-top;
  background-image: url("../img/icons.png");
  background-position: 16px 16px;
  background-repeat: no-repeat;
}
.gpt-acoustic { background-position: -0px 0px;} .gpt-bass { background-position: -16px 0px;} .gpt-drum { background-position: -32px 0px;} .gpt-electric { background-position: -48px 0px;} .gpt-piano { background-position: -64px 0px;} .gpt-sing { background-position: -80px 0px;} .gpt-violin { background-position: -96px 0px;}