One disc barely covers it. Thirteen of the cuts are from the 1970's, natch, which only leaves room for four more, and one of those is the '90's remake of Don't Let The Sun Go Down On Me with George Michael. It's essentially his live concert favourites: Your Song, Tiny Dancer, Crocodile Rock, Philadelphia Freedom, etc. You could pretty much name them without looking, except I doubt too many people would pick Island Girl as a must-have.
At two discs, we get a better look at the '80's which in fact were not a bad decade at all for EJ. Now there's room for Little Jeannie (a #1 in Canada, btw), Sad Songs, Nikita and Sacrifice, all strong ballads, largely his strength at that time. The '90's are a bit more of a problem, but there's Something About The Way You Look Tonight, famous mostly because of its inclusion on the Lady Di tribute single Candle In The Wind 1997 (not here, as per his wishes), and Circle of Life, which every child of the era and every parent will know forever. But in the spirit of inclusion, we then get a run of songs called Electricity, Home Again and Looking Up, none of which I can remember or even attempt to sing along to, from the later albums Peachtree Road, The Diving Board and Wonderful Crazy Night. Hey, why not include a couple of little songs called Border Song and Levon instead? Remember those? I'm betting much of the world does.
For the three disc set, they go back and grab some lesser hits, some vital but some lesser for good reasons. Elton's always loved to do the duet thing, so there's Written In The Stars with LeAnn Rimes, Live Like Horses with Pavarotti, and That's What Friends Are For, with Dionne, Stevie and Gladys. I guess I said lesser hits, but that one was huge, not too many people can stick a #1 single on the bonus disc. Better though are Empty Garden, his tribute to John Lennon, his cover of Lucy In The Sky With Diamonds, another #1, and his soundtrack take on Pinball Wizard, not a single in Canada but it sure got played everywhere.
There is a ton of memorable, fantastic music here, and I don't think you'll go wrong with the three-CD set, but there are pockets of blandness, mostly because of his apparent inability to say no to bad duet songs. Also, a better job could have been done curating the later years, including grabbing a track or two off that fine Leon Russell/Elton John album. Also, even the one-disc version needs a warning sticker: Includes Kiki Dee. I'd still make sure you own Tumbleweed Connection and Madman Across The Water, his true essential albums.