Loop YouTube videos, and control how long you want to play a YouTube video for.
FacePause - Look away to pause YouTube videos
Lark Player - Lark Player – YouTube Music & Free MP3 Top Player is a fine tool developed by Mobiuspace Tech Top Player.
ListenOnRepeat - 24/7 curated music streams
Audiomack - The free SoundCloud alternative
SongFlip - SongFlip – Free Music Streaming and Player is one of the most popular free music streaming apps, that allows you to get access to millions of songs right over your cell phones.
Musicolet - Musicolet is a small yet feature-rich offline Music Player for Android.