What do you want more? Plugins or Themes?

[Oleg06]

You could make a html5 audio embedding plugin. I use mp3-html5.php, but I am not satisfied with the workflow. You can see it being used on my site: https://wouterb.be

I think it would be better to have a plugin page where I can select music file, settings (like play in loop, adding css, etc) and then gives me a shortcode. You could implement optional image or description adding functionallity.
You could optionally add your youtube-plugin functionality to this (just an idea, probably not necessary), so it becomes sort of a general media embedding plugin.

An example of similar functionality, but with links, can be seen with the Links manager plugin.

It's just an idea, I don't need it, but it would be cool.

for ckeditor there is a plugin