Music

Instruments
A Virtual Keyboard
http://www.bgfl.org/bgfl/custom/resources_ftp/client_ftp/ks2/music/piano/

Online Drum Machine
http://www.onemotion.com/flash/drum-machine/

Music 'Toys'
make your own sound landscape. very simple, very clever.
http://isleoftune.com/

Cool
http://wheelof.com/whitney/

Make your own rhythm
http://www.philtulga.com/unifix.html

Beatbox
http://www.turntables.de/

Discover Music that you might like
linking music
http://musicovery.com/

Make Music
Jam Studio
Make and save your own beats
http://www.jamstudio.com/Studio/index.htm
http://soundation.com/studio

Sheet Music
Free Sheet Music, composer info, orchestra, very complete

http://www.makingmusicfun.net/

Understanding Music and the Orchestra

DSO listen by instrument
http://www.dsokids.com/listen/instrumentlist.aspx

DSO listen by composer
http://www.dsokids.com/listen/composerlist.aspx

http://www.sfskids.org/templates/musiclab.asp?pageid=4

What's pitch?
http://www.sfskids.org/templates/musicLabF.asp?pageid=13

Performalateror - play music by number
http://www.sfskids.org/templates/musicLabF.asp?pageid=14

Composerizer - compose simple music
http://www.sfskids.org/templates/musicLabF.asp?pageid=15

What is harmony?
http://www.sfskids.org/templates/musicLabF.asp?pageid=16

What's that symbol - learn the basic music symbols
http://www.sfskids.org/templates/musicLabF.asp?pageid=17

Instrumentation - What do instruments sound like?
http://www.sfskids.org/templates/musicLabF.asp?pageid=18