Components
Music player that shows songs in a tree view following devices folder hierarchy.
Lightweight audio player which features a single over-all playlist with every song on the device.
- songs can be easily browsed following folder hierarchy : great for big music playlist.
- play mp3, ogg, flac, midi, wav, mp4, 3gp
- open-source, the SicMu Player is also available on F-Droid https://f-droid.org/repository/browse/?fdid=souch.smp and GitHub https://github.com/souch/SMP .
Proposal
I'm proposing to add some important features that aren't present in this app, below are the important features I think should be added.
Tag Editor
This is a feature that I believe will be of great use for most users, having to the ability to change the current name and details of a song to whatever they want, most especially when the current song tag is not correct.Background Control
This is an important features that should be implemented in this app. This feature is used to control the music player from background while playing, which doesn't need to lunch the Music player app itself. The previous, play/pause and next.
Mockups / Examples
Here are the examples of how the mentioned /discussed suggestion should look like.
- The edit tag feature should be added to the app like the image below.
And a page to edit tag should be displayed like this
- This is the initial background view of the app before adding a control option
Background control option should be implemented and and similar to the below image. 
Benefits
The above proposed features has a major role and benefit to the users and the app itself in the sense that the app gets more recognition in the app stores.
Tag Editor
Tag Editor gives users the full access to edit the name of a song to whatever they wish to, for instance if they are listening to a song and the title doesn't match up they can easily edit it to the right title with Tag Editor.Background Control
With this feature, users can control the music playing in background quick and easily. This control has four options that controls the app effectively, the previous, play/pause, forward and quit option. The feature can generally control the app without lunching it.
Posted on Utopian.io - Rewarding Open Source Contributors