Structure
Vivaldi's introduzioni are written for a solo singer, either alto or soprano, accompanied by instruments. The musical structure seems to derive from the text: four of the eight (RV 635, 636, 637, and 642) consist of two arias in da capo form surrounding a central recitative. One (RV 638) has a central aria flanked by two recitatives; another (RV 640) has just two movements – recitative then aria – and a third (RV 641) has four movements (two recitatives, aria, recitative). The remaining one (RV 639) has the structure 'aria-recitative-aria' but Vivaldi interwove the second aria into the first movement of the liturgical work which followed it - the Gloria (RV 588).
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