Squeak Etoys is a "media authoring tool"-- software that you can download to your computer
and then use to create your own media. You can write out your project and share it with others.
Etoys runs on any Mac or Windows machine, as well as on the OLPC XO machine.
It is free.
Find out about Etoys.
Text of this guide (for searching): Script Tiles: Sound Category
You can set the pitch with a sound tile and make music in motion.
Click the green clock to start the script. Click on a Star in Supplies and open its Viewer.
Click on basic to open the category menu and choose sound; make two scripts like these.
Click the exclamation points to start and stop the sound. A440 is concert pitch for tuning orchestra instruments.
The pentatonic scale has five notes that combine well with each other.
C# 138.59 D# 155.56
F# 185.00 G# 207.65
A# 233.08.