How to play audio across Impress slides

I want songs to play across slides as the slides change. The slides have lyrics.

You can use the Slide Transition pane to set up Impress so that a sound or a song is played throughout the presentation. To do that: Select the slide where you want the sound to start and go to the Slide transition pane. In the ‘Modify transition’ section, select the entry ‘Other sound’ from the Sound drop-down menu.

You may find it helpful to read the previous at: