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Passacaglio
Passacaglia Pas`sa*ca*glia, Passacaglio Pas`sa*ca*glio, n.
[Sp. pasacalle a certain tune on the guitar, prop., a tune
played in passing through the streets.] (Mus.)
An old Italian or Spanish dance tune, in slow three-four
measure, with divisions on a ground bass, resembling a
chaconne.
Meaning of Passacaglio from wikipedia