<?php
$_SERVER['REMOTE_ADDR']='localhost';
// drupal bootstrap
$drupal_directory = "/var/www/drupal";
chdir($drupal_directory);
define('DRUPAL_ROOT', getcwd());
require_once './includes/bootstrap.inc';
drupal_bootstrap(DRUPAL_BOOTSTRAP_FULL);

// Retrieve Vocabulary ID (VID)
$vocabulary_name='categories';
$vocab = taxonomy_vocabulary_machine_name_load($vocabulary_name);

// bundle = Machine Name of the vocabulary
$query = new EntityFieldQuery();
$query
  ->entityCondition('entity_type', 'taxonomy_term')
  ->entityCondition('bundle', $vocabulary_name)
  ->propertyCondition('vid', $vocab->vid)
  ->fieldCondition('field_music_code', 'value', 'C042', '=');

$results = $query->execute();
if (!empty($results['taxonomy_term'])) {
  foreach($results['taxonomy_term'] as $tid) {
    $term = taxonomy_term_load($tid->tid);
    $name=$term->name;
    echo "Term ID = ",$term->tid," Name = ",$name,PHP_EOL;
    echo "Field Code Client Value = ",$term->field_music_code[LANGUAGE_NONE][0]['value'],PHP_EOL;
  }
}
else
{
  echo "No result for this code ! ",PHP_EOL;
}
?>