well i'm not exactly sure where $song_gender is supposed to come from but it looks like that contains the song genre so:
code:
switch ($song_gender)
{
case 'country_and_western':
die();
case 'techno':
// do something useful here
default:
// unrecognised genre
}
To be honest if you managed to get that far in writing it I can't believe that you needed to explain it all to ask the question.
/ 
