bpimentel

This plugin converts text representations of musical “accidental” symbols into actual symbols. Type them into pages and blog posts like this:
<ul>
<li>A-flat</li>
<li>A-sharp</li>
<li>A-natural</li>
<li>A-double-flat</li>
<li>A-double-sharp</li>
</ul>
Displaying the symbols correctly is tricky, since it depends on the user’s operating system, web browser, and installed fonts. The Accidentals plugin attempts to determine whether the user’s system can display the symbols, and, if it’s not sure, falls back on the typed text. Bear in mind that even if you see the symbols on your own computer, not all site visitors will necessarily see them. And if you don’t see them, some of your visitors will.
The advantage of this system is that it degrades gracefully to the typed text, even if you uninstall the plugin.

Accidentals

Convert text representations of some musical symbols into actual symbols, depending on user's system capabilities.

yamaker

Background Music Manager allows you to add background music to your WordPress site. The music will play only after user interaction due to modern browser restrictions. You can enable or disable music site-wide or only on the home page, set playback time, loop the track continuously, adjust volume, and upload your own music track.
<h3>Features</h3>
<ul>
<li>Enable/Disable Music: Control the background music across your entire site.</li>
<li>Home Page Only: Option to play music exclusively on the home page.</li>
<li>Playback Time: Set the duration (in seconds) for how long the music plays.</li>
<li>Continuous Playback: Loop the music track continuously.</li>
<li>Volume Control: Adjust the playback volume from 0.0 (mute) to 1.0 (full volume).</li>
<li>Upload Music Track: Easily upload your own audio file to be played in the background.</li>
<li>Admin Notice: Inform administrators about browser restrictions on autoplaying audio.</li>
</ul>

Background Music Manager

thx for plugin - Background Music Manager

Manage background music playback on your website.

Accidentals vs Background Music Manager