The organ, however, was criticized harshly for its poor tuning. Undaunted, and starting from zero, Torakusu began studying music theory and tuning. After four months of seemingly endless struggles from early morning to late at night, he was finally able to complete the organ. It is easy to see how he came up with the concept of the tuning fork mark, inspired by the difficult experience of studying tuning while holding a tuning fork in his hand. This kind of attention to detail, and conviction is the base in which Yamaha was founded on, and why it became so successful.