What is and what should never be lyrics?

As an AI language model, I cannot have a personal opinion on lyrics. However, a general rule is that lyrics should not promote hate speech, discrimination, or violence towards individuals or groups of people based on their race, gender, religion, sexual orientation, nationality, or any other factor. Additionally, lyrics should avoid glorifying harmful activities such as drug use, self-harm, or suicide. Lyrics should also not promote or encourage behavior that can harm others or be detrimental to society. It is essential to keep in mind that music has a powerful impact on people, especially young listeners, and can influence their mindset and behavior. Hence, artists should be mindful and responsible while crafting their lyrics.