Brain.fm - Music designed for the brain to enhance focus, relaxation, meditation, naps and sleep within 10 - 15 minutes of use.
Lark Player - Lark Player – YouTube Music & Free MP3 Top Player is a fine tool developed by Mobiuspace Tech Top Player.
Soundlove.io - Choose and mix from 100+ high-quality sounds and noises to improve focus or relax.
Audiomack - The free SoundCloud alternative
Can't Sleep - AI music scientifically designed for sleep
Musicolet - Musicolet is a small yet feature-rich offline Music Player for Android.