I'm a real fan of Philly music and this is a real gem containing almost all the essentials. I wrote "almost" because The Three Degrees are missing which is a real shame. How can they call this 40th Anniversary Collection and not include The Three Degrees? Also the MP3 version is completely different from the CD box as one previous reviewer wrote: some key gems from Harold Melvin & the Blue Notes, The Trammps and others are missing. Maybe that's why the price is cheaper. Still this is a real master piece in pre-disco sounds with the "je ne sais quoi" Philly sound. Just for the above I would have rated 5 stars and even more. I would recommend anyone interested in the good old music days if the 70's-80's to invest on this beauty!