Hiranori (plain match, common match) is the most frequently used of the three styles of congruent (hyōshi ai) rhythms used in nō chant.
The standard twelve syllables of the poetic line (ku) are divided into two hemistichs of 7 and 5 syllables and distributed over a theoretical eight-beat musical phrase (yatsu-byōshi). Generally speaking, the seven-syllable opening hemistich is distributed among four and a half beats, and the five-syllable semi-stitch over three and a half beats. However, the effect varies depending on the type of patterns the drums are playing. With the sparse drum pattern (mitsuji), the twelve syllables are sung with essentially even weight, but matched to the 'continuous' drum pattern (tsuzuke), three of the syllables (usually the 1st, 3rd, and 5th) are extended to double length. A rest for taking a breath comes on the 8th beat.
Greater complexity occurs when the poetic line is longer or shorter than twelve syllables (e.g. 7+4, 6+5, 4+6, etc). When, for instance, the first hemistich has less than 7 syllables, the singing may begin later, or alternatively, single syllables may be drawn out using a melisma. There are also stylistic differences among the various schools (ryū) of chanters and drummers.