Why can not phsicists merge Quantum Theory and General relativity?

Quantum Theory and General Relativity are two theories in physics that describe two very different aspects of the universe. Quantum Theory describes the behavior of particles and atoms on a small scale, while General Relativity describes the behavior of large objects such as galaxies and black holes. The two theories are not compatible with each other, meaning that they cannot be combined into one theory. This is due to the fact that they both describe different aspects of the universe, which are sometimes in conflict with each other. For example, Quantum Theory predicts that particles can act like waves, while General Relativity predicts that gravity is caused by the curvature of space-time. The reason why physicists have not been able to merge the two theories is because of the mathematical complexity involved. The mathematics used in each theory is so different that it has been difficult for scientists to find a way to reconcile the two. An analogy that can help to explain this concept is the relationships between different musical instruments. Each instrument is designed to produce a different sound, and while they can be used together to create a beautiful piece of music, they are still fundamentally different and cannot be combined into one instrument. Fun fact: Scientists have been trying to merge Quantum Theory and General Relativity since the early 1900s, but have not been able to do so!