BarRemote is a mini player for Spotify that sits in your menu bar. It allows you to quickly see what's currently playing and control playback.
You can search the Spotify library directly in the app to select something to play. You can browse an artist's albums and play and see album details.
Playback controls can be shown or hidden from the menu bar, from the settings screen.
The mini player has support for seeking in the current track, controlling volume, toggling repeat and shuffle on or off.