I have a small two channel audio mixer in the shack for ham radio listening. On the one input is the station receiver. On the second input is the audio output from my computer, which is listening to an online SDR receiver. This comes in handy as I can easily select the source with the better signal reception. Hitting the PTT mutes them both.
But I recently discovered another benefit from this arrangement.
While listening on the local receiver I can play music through my computer and, by mixing the two, add background music to the station I'm listening to. I've found this to be quite enjoyable as it adds a kind of production value to the otherwise bland reception of speech alone. Played softly in the background, music creates a wonderful enhancement that is very pleasing to the ear.
This is nothing new in broadcast radio, but is not permitted to be
transmitted on amateur radio. But adding music on the
reception end is
no problemo. Here's a nice piece of music that works quite well when listening to the average ham QSO. Loop it!
https://www.youtube.com/watch?v=xa3q6As8NdY