We are told:

This is the first posthumous release from Tom Petty and is a career-spanning box set that focuses on Petty as a great songwriter. The compilation includes 8 unreleased songs plus many of Petty’s hits, usually as alternate or live versions. The set also includes some of his lesser known songs – especially from the WB period (1995 onwards). There are songs from Tom Petty & The Heartbreakers, Tom Petty solo and Mudcrutch.

Deluxe Edition — A 4-CD set that features all 60 tracks, plus a 52-page booklet with rare and previously unseen photographs of Tom, his bandmates, family and friends. The booklet also features detailed track-by-track liner notes by noted journalist and Tom Petty aficionado Bud Scoppa, who drew upon his previous interviews with Tom and new conversations with Mike Campbell, Benmont Tench and Ryan Ulyate, as well as Adria and Dana Petty.