If you've got Music Masterworks MIDI composition software, you can use these scary sound effects to make a fun haunted house -- first you create solemn organ chords, and then you insert the wav files of howling and evil laughter.

You can download a 30-day trial on their website.

Download this zipped file of halloween sound effects:: scarysounds

And download this lesson plan: lessonplan

The lesson plan is very detailed and teaches some basic music theory. And we all know that music can teach math and fractions and such like.

Don't forget to let kids print out their musical score -- it looks really cool and professional.

Obviously, you'll need speakers or headphones to get the full effect.