iTunes

• iTunesSearchLyrics.scpt
  Filter the songs in the default playlist "All".

• iTunesShowLyrics.scpt
  Show the lyrics for the selected song, or the current playing song.

Installation

• Copy scripts to ~/Library/iTunes/Scripts/

• Go to System Preferences -> Keyboards -> Shortcuts -> App Shortcuts -> Add

  Application	Menu Title	Keyboard Shortcut
  iTunes	Search in lyrics	⇧⌘F (cmd+shift+f)
  iTunes	Show lyrics	⇧⌘L (cmd+shift+l)

Messages

New scripts and some updated for Messages.app. Apple didn't update the scripts included in macOS.

Installation

• Move/Replace scripts to ~/Library/Application Scripts/com.apple.iChat/
• In Messages.app go to Preferences and choose the script you want to use.