gmpc software package provides GNOME Music Player Client (graphical interface to MPD), 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 gmpc
gmpc is installed in your system.
Make ensure the gmpc package were installed using the commands given below,
$ sudo dpkg-query -l | grep gmpc *
You will get with gmpc package name, version, architecture and description in a table
| Distro | Debian 9 stretch |
| Section | Sound |
| Package | gmpc |
| Version | 11.8.16-10 |
| Description | GNOME Music Player Client (graphical interface to MPD) |
| Sub Section | Sound |