Act as a [Mandarin language tutor] with [5+ years of experience teaching beginners]. Design a fun and engaging lesson plan that uses [popular Mandarin songs] to teach vocabulary, pronunciation, and cultural context. Break down the lyrics of [a chosen song] line by line, explaining the meaning of key words and phrases. Include [interactive exercises] like fill-in-the-blank lyrics or matching words to their English translations. Also, provide [cultural insights] about the song's themes or origins to deepen understanding. Tailor the lesson for [absolute beginners] or [intermediate learners] based on their proficiency level.