Denied is a menu bar app that sees what you’re playing and automatically skips songs that you dislike.
This open source lyric grabber lives in your menu bar. For iTunes, Spotify, Vox and Audirvana Plus.
With Plaaying you control media (support for iTunes and Spotify) played on your Mac. The menu bar app is available in four attractive, proactive designs. Auto-Share can tell Twitter every song and video that plays without you lifting a finger.
Shazam is (also) a menu bar app. Just one click to identify the current song.