Did you just find a file that has a digital signature from Piano Marvel? If so, please read on.
You will typically notice Piano Marvel when running the file. The publisher name shows up as the "Verified publisher" in the UAC dialog as the screenshot shows:

You can view the additional details from the Piano Marvel digital signature with the following steps:
Here's a screencap of a file digitally signed by Piano Marvel:

As you can see in the screengrab above, Windows states that "This digital signature is OK". This implies that the file has been published by Piano Marvel and that the file has not been tampered with.
If you click the View Certificate button shown in the screencap above, you can view all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, and so on. You can also view the address for Piano Marvel, such as the street name, city and country.
Thawte Code Signing CA - G2 has issued the Piano Marvel certificates. You can also see the details of the issuer by clicking the View Certificate button shown in the screenshot above.
The following are the Piano Marvel files I've collected, thanks to the FreeFixer users.Unfortunately I don't have any scan result from VirusTotal available for the Piano Marvel files at the moment. The scan results will appear here as soon as a FreeFixer user uploads a file digitally signed by Piano Marvel.
| Detection Ratio | File Name |
|---|---|
| Not available | pianomarvel.exe |
The analysis has been done on certificates with the following serial numbers: