exfalso software package provides audio tag editor for GTK+, you can install in your Debian 9 (Stretch) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install exfalso
exfalso is installed in your system.
Make ensure the exfalso package were installed using the commands given below,
$ sudo dpkg-query -l | grep exfalso *
You will get with exfalso package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Sound |
| Package | exfalso |
| Version | 3.7.0-1 |
| Description | audio tag editor for GTK+ |
| Sub Section | Sound |