There[SQ]s no single app called "MP3 Downloader, YouTube Player for Android." That[SQ]s a description of a *type* of app, not a specific app name. Many apps on the Google Play Store offer both MP3 downloading and YouTube playback functionality.

However, it[SQ]s crucial to understand that

most apps claiming to download MP3s from YouTube are illegal and often unsafe.

YouTube[SQ]s terms of service prohibit downloading videos or audio without permission from the copyright holder. Apps that facilitate this often include malware, spyware, or other harmful code.

Therefore, if you find an app with that description, I strongly advise against using it. Instead, consider these legal and safe alternatives :

*

YouTube Premium:

This paid subscription service allows you to download YouTube videos (including audio) for offline playback. This is the most legitimate and safest way to achieve what you[SQ]re looking for.
*

Music Streaming Services:

Services like Spotify, Apple Music, Amazon Music, and others offer vast libraries of music that you can legally stream and often download for offline listening.

Using official and legal methods protects you from malware and respects the rights of artists and copyright holders. Downloading copyrighted material without permission is illegal and can have serious consequences.