#play all mp3s in current directory (without video display)
mpv --no-vid --input-ipc-server=/tmp/mpvsocket *.mp3

#now mpv commands can be sent to /tmp/mpvsocket with socat
echo cycle pause | socat - /tmp/mpvsocket
echo playlist_prev | socat - /tmp/mpvsocket                                                                                                   
echo playlist_next | socat - /tmp/mpvsocket

#Jump forward of back 5 seconds
echo seek  5| socat - /tmp/mpvsocket
echo seek  -5| socat - /tmp/mpvsocket

#You can also send key presses
#Example for Volume Control
echo '{ "command": [ "keypress", "0" ] }' | socat - /tmp/mpvsocket
echo '{ "command": [ "keypress", "9" ] }' | socat - /tmp/mpvsocket

#if you have youtube-dl install you can stream playlists
mpv --no-vid --input-ipc-server=/tmp/mpvsocket "https://www.youtube.com/playlist?list=PLG1znKjmrCrZfQAWkBjQsFw-gLuHzTNa4"

#note, kill previous mpv before starting a new process.