Nulloy

First up, the functionality: you can use Nulloy to play music. This music player provides support for MP3, FLAC, OGG, WMA, AIFF, and other music formats.
Next up, the visual experience: Nulloy displays a waveform progress bar on its interface, interface that provides support for skins.

Nulloy is available for multiple platforms: Windows, Mac OS X, Ubuntu/Debian, and Fedora.
Focusing on Windows alone, it is worth noting that you will not have to install anything. You just have to download an archive, extract its contents, and run the Nulloy executable.

Nulloy’s interface provides support for multiple languages: English, French, German, Polish and Russian.
Nulloy’s interface also provides support for skins: Native, Metro, Silver. Please note that if you change the skin, you will have to restart the application.

No matter what skin you choose, one thing remains unchanged: the interface remains incredibly easy to use. As previously mentioned, the interface displays a waveform progress bar on its interface. When you select an audio track, Nulloy generates a waveform display for the track and allows you to use it as a progress bar.

Here’s a quick look at what can be done with Nulloy: load music files, load a folder that contains music files (lots of formats are supported); manage playlist, save playlist; show cover art; use hotkeys to start the playback, stop the playback, jump to the next track; repeat, shuffle tracks.

Nulloy is free software. If you would like to support the music player’s development, you are invited to make a donation.

There’s much to like about Nulloy: it is available for multiple platforms, its interface provides support for skins, it can be used to play various music file formats, it has a waveform progress bar, it is free.