Okay, so there's lot a great material not on this compilation. But there is a fairly even number of songs from each of the major periods of his career. It's rather hard to choose a definite dividing line between periods, but basically, The first six songs are the young Elvis, and include "That's All Right" and "Baby, Let's Play House", which don't appear on as many collections as the others. 7-13 cover development of his voice and style, including the less often heard "One Night," "Trouble," and "Reconsider, Baby". 14-18 represents a return to the type of song the younger Elvis sang, but with a developed style...all of these being less commonly heard: "Little Sister", "Return to Sender", "(You're the) Devil In Disguise", "It Hurts Me", and "Big Boss Man". Cuts 19-25 include the fully mature Elvis with "In the Ghetto", "Only the Strong Survive", "Polk Salad Annie", "An American Trilogy", "Burning Love", and "Promised Land" along with the longer version of "Suspicious Minds". So this is an excellant first Elvis CD for your collection, but even if you already have one or two CD's, you'll probably find that you're missing about 2/3 of the material available on this collection.