: Much of his experimental and collaborative work is documented on the Silkroad website .
While the specific .7z file is not currently available for direct download through verified official repositories, here is context on what "Yo Yo Ma Periscope" refers to and how you might find related content: Yo Yo Ma Periscope.7z
If you are looking for these intimate performances, you can find officially preserved videos and similar content through these channels: : Much of his experimental and collaborative work