This is pretty easy with a simple shell script. By "intro" I've decided 15 seconds is a good time - you can change this of course.
It also assumes all the songs are MP3 files, if they're not remove the
~/Music to wherever the songs are saved - e.g. on an external hard drive would be
intro=15 # Change this to change the played time.
for filename in ~/Music/*.mp3 ~/Music/**/*.mp3; do # Remove .mp3 to change type.
audacious -H "$filename" &
Simply paste this into Leafpad (or your chosen editor) and save it in your home area with a
Then run these commands, changing
filename.sh for what you named it.
chmod +x filename.sh
The first sets it to be allowed to run, the second will run it. Note that it won't open the window because of the
-H option. This is because you are on Lubuntu, and are unlikely to have much memory.
This script will print our the name of the file when it starts to play it, so you know what you are listening to.