Discover the story of the song > What’s on My Mind – Kansas

The protagonist was left out in the cold by someone they loved, but they are now in a better place and looking back at their past with no pain. They found someone new, or maybe they found themselves, and they feel complete with their partner because they fit together like a lock and a key. The protagonist is only saying what's on their mind, which is that they never want to leave their partner because they filled an empty space and fixed their broken heart.