amplifyforspotify

amplifyforspotify is a convenient menu bar app to simplify the way you use Spotify. You can use the program to check the current track, adjust Spotify volume, and control playback without interrupting what you're working on.

The tool optionally shows notifications whenever the song playing in Spotify changes, so you know what's playing right away. Amplify also offers customizable keyboard shortcuts for toggling the mini-player and controlling playback.