You forgot to message the channel:

Code:
on *:TEXT:!song:#: {
 if ((%floodsong) || ($($+(%,floodsong.,$nick),2))) { return }
 set -u10 %floodsong On
 set -u30 %floodsong. $+ $nick On
 msg # $read(C:\Users\Cawley\Downloads\SMG OBS\current_song.txt)
}