A song may have an undertone.Logical formLearned from4 sentences. An undertone can be constituted-of-or-filled-with humour.Logical formLearned from4 sentences. Undertones can be macabre.Logical formLearned from4 sentences. Undertones can be controversial.Logical formLearned from4 sentences. An undertone can be revolutionary.Logical formLearned from4 sentences. Undertones can be constituted-of-or-filled-with blue.Logical formLearned from4 sentences. Undertones can be salacious.Logical formLearned from4 sentences. Undertones can be constituted-of-or-filled-with social commentary.Logical formLearned from4 sentences. Undertones can be bluish.Logical formLearned from4 sentences. An undertone can be erotic.Logical formLearned from4 sentences. An undertone can be mystical.Logical formLearned from4 sentences. An undertone can be haunting.Logical formLearned from4 sentences. An undertone can be humanitarian.Logical formLearned from4 sentences. An undertone can be urgent.Logical formLearned from4 sentences. An undertone can be unpleasant.Logical formLearned from4 sentences.