Do you know how to use torrents? I actually couldn't find the Hamelin set, either; I am really shocked. I know it used to be very easy to get online. I think it might be going around on da SDC. Either way, if you know how to use torrents, you can download it here:
https://rutracker.org/forum/viewtopic.php?t=1473235You will need to sign up for the forum, which is in Russian. It is fairly straight forward; you can pretty much guess whether you're supposed to be typing your password, your username etc. If you have trouble, just use this program:
https://www.babelfish.yahoo.com/And manually input each line. Using google's translate feature will not allow you to store cookies, so you can not use that. To register, click where I have drawn a red circle (the red block is to cover up some. . . non-pianostreet-appropriate bookmarks xD):

To download the torrent (you must sign up and sign in first), click the lavender-colored floppy disc in that first link I gave you, after scrolling to the bottom of the first post in that thread. Basically, click on this:

If you do not know how to use a torrent program, ask your children. Although it really is quite easy. Simply search google for a program called "utorrent", download/install it, and that's it. Once you have that installed, click the icon above, and select "open with" when the download window pops up in your browser. utorrent should be there already, but if not, just select that as the program you want to open the file with. When you do, the utorrent program will open up on its own, and a window will pop open showing you all the files you're downloading; just hit "ok" and it will download. It may take a while. Once it's done, utorrent will tell you the file has finished, and if you check on it, the status bar will show 100% completed. Right click it, select "open containing folder", and there you have it. You might have to close utorrent to move the files to your desktop and/or burn them to CD's. If the files are in a format you're not familiar with (for instance, you're probably familiar with mp3 and wav, but they might be in .ape or .flac) just let me know and I can guide you through that, as well. It's also very easy.