We have team-meetings via Google Hangouts regularly. In order to give it a theme-song or to set the mood, I would like to play an audio-file when all have gathered and the "official" part starts.
I have the audio in a MP3-file on my machine.
I use a Linux (Ubuntu 14.04 LTS) with Google Chrome to connect to the video call.
I do not want to just crank up speakers and "redirect" the audio through the air to the microphone. A computer-internal software solution seems more appropriate. Any commandline-tool would be great. I have the feeling that gstreamer-something might help, but I do not understand how to achieve my goal.
So, how can I play audio to people on an hangout?
UPDATE
The mp3 I intend to play is freely available or I will get the rights for the intended usage. In any case, the legal ramifications of this are not part of the question.
UPDATE
I am still interested in a solution, currently using Ubuntu 16.04 (switching to 18.04 or 20.04 soon) and whatever Google calls their video-meeting then :-)