One final point about
greatness is that it so often requires the lens of retrospection to reveal its
quintessenve. For example, if you asked 1000 keen music fans at random in the
UK which 3 albums from the 14 years of 1966 to 1979 they considered to be the
best and most innovative, I think the range of different albums chosen would be
narrower than if you asked 1000 keen music fans at random in the UK which 3
albums from the past 14 years (the noughties - the years 2003 to 2016) they
considered to be the best and most innovative.
I think that's probably because while there are more albums being produced in the modern era, there are fewer great ones - but also because people need a considerable passage of time to assess what makes an album really great, and today probably is too soon to assess the past 14 years with a proper consideration.