<input type="checkbox" name="rock" id="genre-rock" checked="checked" />
<label for="genre-rock">Rock</label>
<input type="checkbox" name="disco" id="genre-disco" disabled="disabled" />
<label for="genre-disco">Disco</label>
<input type="checkbox" name="metal" id="genre-metal" />
<label for="genre-metal">Metal</label>