This appears to be a fork of the open source app, Jockey Music Player. It's completely free and has no ads, and somehow runs more smoothly than Yo.
You can check it out here: Jockey Music Player on the Google Play Store.

Taking an open source app and adding ads to it does not make it your work. If you really want people to take you seriously, you need to put in some effort, and perhaps credit the main developer.

<strong>Jockey</strong>
Jockey is a music player for Android focused on performance, simplicity, and design that I've been working on independently for the past year as a personal project.

Features:
- Full Material Design and customizable interface with 12 themes to choose from
- Last.fm integration for retrieving artist images and descriptions
- Smart Playlists with fully customizable rules
- All of the core functionality you'd expect in a music player
- Completely free and open source

It's admittedly missing a number of enthusiast level features like equalizers, and gapless playback among other things, but I hope to implement these and more in the upcoming months.

YMusic from XDA allows you to stream(audio)/download music/videos from Youtube and play local music as well. With the latest update(v2.0.0+), the UI + some internal functions(I assume) is forked from Jockey which is an open source music player.

Jockey

Jockey is a music player for Android that I've been working on for the past year as a personal project based on simplicity, performance, and design.
Features:
- Full Material Design with 12 theme combinations
- Last.fm integration for retrieving artist images and descriptions
- Smart Playlists with user-selected rules
- Completely free and open source

More features including a fully customizable equalizer are coming very soon.

Jockey is open source with no ads. There's a fork of it called Ymusic, specialized in downloading Youtube music.

Or the jockey app is based on https://play.google.com/store/apps/details?id=com.marverenic.music

Shameless self-plug: Jockey. I built Jockey with the focus of design, performance, and simplicity so it might not have more all the advanced features you want if you're a serious audiophile, but feel free to give it a shot.