According to Progarchives:
One common misconception that must be addressed is the belief that any prog band from Italy is an RPI band. There are bands from Italy more appropriate for other genres. As an example, a pure and obvious post-rock band who just happen to be from Rome are going to be in the post-rock sub, not RPI. A pure jazz-fusion band with no RPI characteristics to their sound could be easily placed in the Jazz/Fusion subgenre.
Rock Progressivo Italiano definition
aka "RPI"
http://www.progarchives.com/subgenre.asp?style=28
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