BeardedSpice allows you to control web-based media players and some native apps (including iTunes, Spotify, VLC, Vox, and Downcast) with the media keys found on Mac keyboards. In other words: It wrests control of your media keys from iTunes and hands it back to you.
Breakaway lets you control iTunes via the volume control buttons and the headphone jack. The app even pauses the song playing in iTunes when you pull your headphones from the jack. When you plug them back in, your song will automatically resume from where it left off.
Carol is a minimal lyrics app that sits in your menu bar for quick access. It supports Apple Music and Spotify, and provides options to change text size and open lyrics in browser.
A SoundCloud player that lives in your menubar and will notify you when a new track is playing, so you always know what you’re listening to.