All German clubs have a specific song that is played when they score.
The vids in this link tells you what song is played for what club...
<a class="postlink" href="http://www.fanartisch.de/news/bundesliga-tor-songs-fussball-tor-hymnen-tor-musik-tore-video-deutschland/" onclick="window.open(this.href);return false;">http://www.fanartisch.de/news/bundeslig ... utschland/</a>
Some seemingly dodgy songs in there, but they fit perfectly with the mood whenever a goal is scored and gets the fans on their feet, chanting along with the tune and clapping away (like the sound byte from the Mainz song, red and white stripes 6:50). Those that watch the Bundesliga on live streams or whatever might have heard these songs in the background :-)
It's tradition in Germany and elsewhere in Europe and we don't care if anybody else thinks its low brow or uncool or lame or whatever. We enjoy it and always will :-)