Progre is what they call progressive rock.  The feature of progressive rock  is its avant-garde method such as  irregular rhythm and unusual sound connections. When it come to progressive rock,  YES would be the best example. The figure below shows the result of analyzing the tune called "Round About" from their album titled "Fragile ".  As expected, the slope of the graph is steep.

The figure below shows the result of analyzing the tune called "Cans And Brahms" from "Fragile".  This is the arrangement of Brahms' tune. You can see that the slope is gentler than that of "Round About" since  this tune is based on classical music.