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A cadential 64 would normally occur before a V, and after an IV, ii, V/V, viio/V, It. 6, Fr. 6, or Ger. 6. Does a cadential 64 have tonic or dominant function? (Or... maybe... subdominant function...?)

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It is a decoration of the dominant by a double appoggiatura, which resolves to V:

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It is traditionally seen as a voice leading event rather than a distinct harmony. As such, it has a dominant function.