Did you just stumble upon a file that is digitally signed by Musicnotes, Inc.? If that's the case, please read on.
You will probably notice Musicnotes, Inc. when clicking to run the file. The publisher name is then displayed as the "Verified publisher" in the UAC dialog as the screencap shows:

You can view additional details from the Musicnotes, Inc. certificate with the following procedure:
Here is a screenshot of a file that has been digitally signed by Musicnotes, Inc.:

As you can see in the screencap above, Windows states that "This digital signature is OK". This implies that the file has been published by Musicnotes, Inc. and that no one has tampered with the file.
If you click the View Certificate button shown in the screenshot above, you can see all the details of the certificate, such as when it was issued, who issued the certificate, how long it is valid, etc. You can also view the address for Musicnotes, Inc., such as the street name, city and country.
VeriSign Class 3 Code Signing 2009-2 CA has issued the Musicnotes, Inc. certificates. You can also view the details of the issuer by clicking the View Certificate button shown in the screenshot above.
These are the Musicnotes, Inc. files I've collected, thanks to the FreeFixer users.
| Detection Ratio | File Name |
|---|---|
| 0/56 | unins000.exe |
The detection percentage is based on that I've gathered 56 scan reports for the Musicnotes, Inc. files. 0 of these scan results came up with some sort of detection. If you like, you can view the full details of the scan results by examining the files listed above.
The analysis is based on certificates with the following serial numbers: