DiskyT - Youtube playlists done right
Plexamp - A small music player with a number of unique features
OrganizeTube - Create video playlists from Youtube, Vimeo and other sources
Vinyls - Vinyls is a music player that lets you listen to your music without any complicated setup.
Tuned Rocks📺 - Discover🔎 curated Youtube videos 24/7
Poolside FM for iPhone - A pool party in your pocket