Feel free to view these software demos.  Have fun!

http://www.finalemusic.com/notepad 

A free copy of Finale Notepad is available. This is a music notation software program for both Macintosh and Windows platforms. Music can be displayed and played back through the computer.

http://www.sibelius.com/education/

Dowload demos of notation software and other educational music software published by Sibelius.  Groovy music has not been tested by us as of yet, but promises to be good for the elementary level.

http://www.creatingmusic.com/index.html

Morton Subotnick's Creating Music web site. Sample similar activities that are part of Hearing Music, Making Music and Making More Music by Subotnick. Excellent composing areas for students with disabilities.
 

http://www.pgmusic.com/

Download demos of Band-in-a-Box accompaniment software and other products. Use Band-in-a-Box with older students. Features include computer generated accompaniments in hundreds of styles. Also, great visual of percussion instruments that can be clicked on and played. Music can be played at slower tempos and lyrics and music notation highlights as music plays back through computer or MIDI system.

http://www.harmonicvision.com/

Music Ace software demos. Music notation reading tutorials are engaging to children and students can see visual animations that show different musical concepts. The Doodle Pad is an excellent composition program.

http://www.apple.com/ilife/garageband/

Garageband comes on Macintosh computers and is a great program for composing music using loops of pre-recorded music or the student can record their own music. Podcasts can also be created in Garageband.
No demos here but you can read about the program and see sample screens. The view is especially good for students with some types of learning disabilities that impact music reading because music is displayed in either traditional music notation or graphic notation.

http://www.apple.com/itunes/download/

iTunes free software for Windows or Mac. Software for downloading recorded music or podcasts.

http://www.sonymediasoftware.com/products/showproduct.asp?PID=971

Acid Music Studio, a similar program to Apple's Garageband but a bit less intuitive and easy for students with disabilities to maneuver.
Windows only.

http://www.emtbook.net/

Great list of software for music education is listed in Dave Williams and Peter Webster's working music software area on the site for their Experiencing Music Technology book.