Feature summary:
As an audio uploader, I want to associate an image with the audio file.
As a reader, I want to see those images when browsing audio or search results.
As the MediaViewer, I want to have those images available to render while showing other context about the file

Use case(s) (list the steps that you performed to discover that problem, and describe the actual underlying problem which you want to solve. Do not describe only a solution):
https://commons.wikimedia.org/w/index.php?search=greek+songs&title=Special:MediaSearch&go=Go&type=audio

Benefits (why should this be implemented?):
Beautiful, faster lookup and more context than the name of the file, more satisfying upload experience, greater reuse!