I agree with NauAdpi.. NOT ALL serenading is hazing, my chapter goes in all black pin attire.. (which means no low cut, or extreme mini- tight dresses) and we ALL sing...but the new members have roses to hand out.
and we don't sing our dirty songs to the fraternites. OH and BTW the pink pajamas song is a Girl Scout song.. well at least I learned back in the day at girl scout camp !