To subtly express extreme liberal ideas in music without being widely noticed, the following forms and techniques can be considered: 1. **Metaphors and Symbols**: Expressing liberal ideas through metaphors and symbols in lyrics. For example, natural imagery (such as the sky, the ocean) can be used to symbolize freedom, as well as images related to oppression and bondage (such as chains, prisons) for contrast. 2. **Ethnic or Folk Style**: Using folk or ethnic music styles, which are often considered simple and traditional, can superficially tell personal stories while actually conveying an idea of opposition to authority. 3. **Art Music**: Using experimental or avant-garde music forms, which may be difficult to widely understand, can innovate in musical structure and harmony to convey a spirit of rebellion and freedom. 4. **Narrative Style**: By telling the story of individuals struggling under oppression and pursuing freedom, carefully depicting the inner world of the characters, and using the perspective of one person or a small group to explore broader liberal themes. 5. **Satire and Humor**: Using satire and humor in lyrics to disguise criticism of social norms and institutions often allows the audience to accept these views without being directly aware of it. 6. **Music Structure and Rhythm**: Using erratic rhythms and structures to reflect the opposition between freedom and restraint. For example, different styles and rhythms can be combined in a piece of music to symbolize free flow while reflecting the restrictions of norms. 7. **Interaction and Participation**: Introducing elements of audience participation in live performances, allowing the audience to experience the feeling of freedom together, and conveying liberal ideas in a subtle way. Through these forms and techniques, extreme liberal ideas can be expressed implicitly without directly stating a position.