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This study investigates the intrinsic relationship between mathematics and classical music by analyzing harmonic patterns in compositions of renowned composers such as Bach, Mozart, and and Beethoven. The research employs an analytical quantitative approach, using statistical tools to map and identify numerical ratios within musical intervals and the relationships between chords. Data were collected from selected musical works to examine interval structures and harmonic progression patterns. Findings reveal that classical music exhibits consistent mathematical patterns, including the octave (2:1), perfect fifth (3:2), and other proportional relationships that form the basis of chord construction and harmonic coherence. These patterns demonstrate that mathematical principles are inherently embedded in musical compositions, allowing for an objective analysis of music structure without diminishing its aesthetic and emotional value. Furthermore, the study highlights the value of an interdisciplinary perspective, combining quantitative analysis with traditional music aesthetics, which provides new insights into understanding compositional techniques and creativity. The results also suggest that recognizing mathematical structures in music can contribute to a deeper understanding of music theory and education, enhancing how students and scholars approach musical analysis. Overall, this research emphasizes that integrating mathematical and artistic perspectives not only supports the scientific study of music but also encourages a holistic appreciation of the creative process, bridging the gap between art and science while offering practical implications for music pedagogy, theory, and performance studies.

The creative economy is a growing and promising sector in Indonesia. However, this development cannot be separated from the role of an effective marketing strategy in marketing the products and services it produces. Students are one of the potential consumer segments of the creative industry. The creative economy of bouquet marketing among students is useful for honing certain talents, skills and creativity from the community to provide welfare and increase pocket money. This study uses a descriptive qualitative method, namely by explaining bouquet marketing as a developer of creative economic marketing strategies among students in a narrative form. Students consider the creative economy as a place that has great potential and opportunities. They see that creative industries such as art, design, music, film, fashion, and computer games can produce innovative works and create new jobs. In addition, the creative economy is considered as a space where one can express their creativity freely. The marketing strategy used by students to promote their business is to use social media such as WhatsApp, Instagram and others. There are several strategies for online marketing that might attract potential customers. Among them is using attractive pictures or videos, visuals are very important in attracting the attention of online consumers. The suggestion is to promote more often, create more so that customers are interested.  

This study examines the effectiveness of STEM (Science, Technology, Engineering, and Mathematics) education in enhancing problem-solving skills among high school students. With the increasing demand for critical thinking and problem-solving abilities in the workforce, STEM education has become a crucial approach to preparing students for future challenges. The study aims to evaluate how project-based STEM curricula impact students' creativity, analytical skills, and overall problem-solving capabilities. Using a quasi-experimental design with a control group, the research was conducted with high school students who participated in STEM-based lessons involving the 5E instructional model. Data collection involved pre- and post-tests, classroom observations, and semi-structured interviews to measure changes in student skills. The findings indicate that students exposed to STEM education demonstrated significant improvements in problem-solving, creativity, and analytical thinking compared to their peers in traditional lecture-based classes. The study highlights the advantages of project-based learning in promoting active student engagement and fostering skills necessary for addressing real-world problems. These results suggest that STEM education can be more effective than traditional methods in cultivating essential 21st-century skills. The study recommends the broader implementation of STEM strategies in secondary education and further exploration of the long-term impact of STEM learning on various skills required in the professional world.

Islamic calligraphy is one of the cultural treasures of the Indonesian archipelago which must be preserved. Learning Islamic calligraphy increases the imagination, creativity and intellectual development of students. Of course, there are not many state school students who are talented in the art of calligraphy compared to private Islamic schools. But this does not mean that they do not have creativity in Islamic calligraphy. This community service activity aims to overcome this. Islamic calligraphy training activities use the Participatory Action Research (PAR) approach where the cycle includes KUPAR (to Know, to Understand, to Plan, to Action and to Reflection). This service activity was carried out for students at Wiradesa Public Middle School 2, Pekalongan Regency, for 2 weeks. The result of this community service activity in the form of training in the art of Islamic calligraphy is that Wiradesa 2 Public Middle School students are very enthusiastic in learning to write Islamic calligraphy. This is evidenced by the results of Islamic calligraphy that has been made by students of Wiradesa 2 Public Middle School, their writing is increasingly developing and according to the rules of Islamic calligraphy. With this training, students become confident to develop their creativity and express their imagination in the form of works in the form of Islamic calligraphy.