As the title and subtitle imply, this is a kind of greatest-hits album, with music selected by ECM label producer Manfred Eicher from the 12 albums on the label devoted to the music of Arvo Pärt. Pärt's music is so malleable that people tend to make their own versions of it rather than collect it, but if you wanted an anthology as a starter box, this would be the one to choose. Eicher has worked closely with Pärt since the 1980s, and he has indeed made a sensible "sequence" out of works that do not have a lot of contrast among them.