How/where to add class name (i.e. class="tune_in_link") to the 'Tune in' links?
I would need this since I want to open up in a jquerypopupwindow when clicking a 'Tune in' link.

/**
 * Theme a schedule's web streams.
 *
 * @param $nid
 *   A station schedule node id (might be on a remote site).
 * @param $streams
 *   Schedule's streams.
 */
function theme_station_streams($streams) {
  $items = array();
  foreach ((array) $streams as $key => $stream) {
    $items[] = l($stream['name'], $stream['m3u_url'], array('title' => $stream['description']));
  }
  if (count($items)) {
    return t('Tune in:') .' '. station_ored_list($items);
  }