{% macro render_song(mp3) -%}
<div class="song" id="song_{{ mp3.sha1 }}">
  <div class="ctlbox" style="display:none;">
    <a id="song_{{ mp3.sha1 }}_mlt" class="ctl_btn ctl_love"></a>
    <a id="song_{{ mp3.sha1 }}_remove" class="ctl_btn ctl_remove"></a>
  </div>
  <a id="play_{{ mp3.sha1 }}" class="song_a">
    <span class="artist">{{ mp3.artist or 'Unknown' | e }}</span>
    - <span class="title">{{ mp3.title or 'Unknown' | e }}</span>
  </a>
  {%- if mp3.album -%}
  <br>
  <a class="album_a"><span class="album">{{ mp3.album }}</span></a>
  {%- endif -%}
</div>
{%- endmacro %}