This page is a convenient place from which to download files for the EV3COMPOS3R II lego ev3 project.
If you have the retail set, then the project file you need is here, called composerII.ev3
If you have the Education Core set plus the Education expansion set, then the file you need is here, called compos3rEdII.ev3
In either case, you can use the free music pack downloads file called public_music_packs.zip
It is useful but not essential to read through the various posts about EV3COMPOS3R on this site before constructing the project. Full constructional and descriptive details are included in the project files
Videos about the project, both the original and new version II are on my youtube channel