"What Is and What Should Never Be" is a song by Led Zeppelin. The lyrics describe a man who is trying to convince a woman to come with him to a castle where they can be together. The song title refers to the idea of what could be versus what should never be. The man is asking the woman to take a chance on what could be, even though it may not be what should be. The song is open to interpretation, but some believe it is about the struggle between reality and fantasy, and the desire to escape from the mundane aspects of life. The lyrics are as follows:

And if I say to you tomorrow
Take my hand, child,