The web page does more justice than I can. This program is great for students to practice at home. It comes with a huge library of thousands of band pieces that your child can play along with at home: it will point out their mistakes and help them fix those mistakes. It is sort of like having a private tutor in your home!
The premeire music camp for serious musicians. This is a 5 week camp held every summer Interlochen, Michigan, for students in grades 3-12. The oldest continuously running music camp, this camp is for serious musicians from all over the world.
Tutorials and practice guides for written construction of music and using your ears to write and hear how music written. If you have ever created tune in your head and wanted to able write it out, harmonize it, and arrange for your friends, this a good starting place!
MuseScore is a FREE music notation software program through which you can write your own music and play it back, print it off, transpose, etc. If you fancy yourself a computer genius, it is open source and they are always lookig for tweaks to make the program better.