“Strong song,” the converse of “weak song,” or yowagin, when referring to the way a melody of a chant is sung. While tsuyogin include many different types of singing styles, it mainly refers to powerful, louder chants. More attention is paid to breathing in tsuyogin than melody, with higher and lower sounds representing scales within the same interval and unique scale structure. Tsuyogin are notated in chant books as tsuyoku and are also known as gōgin.