Although we may now assume that the composer of the title of the legal Edition get their royalties, only good is a musician in a little session: "'A Foggy Day' is with me not in it" or "title on page so and so - mark I do not "because it is a losing battle.
As an aside: most jazz greats like Charlie Parker, Dizzy Gillespie, Miles Davis, Bill Evans, among others no longer benefit from this legal version; With luck there may have their descendants something about it. And one more thing: the Real Book was not created by professional Thaie, but by two well-known jazz musicians: without even benefiting Paul Bley and Steve Swallow, who thereby proved the jazz community in the world a great service to have them
Insolence is only that the new content is not signaled by another presentation; the cover page of this issue differs from the original either by color or by the signature, only the number '6' refers to the new edition. So I wanted to give my two sons one copy for Christmas, in the good faith belief that the changes from Hal Leonard were really only marginally (as others described elsewhere), ended up being very disappointed with the content. At least the return of both copies on Amazon was problemelos possible.
Unfortunately, the original is no longer to get 'under the table'; a good copy shop can help because possibly - in the service of the lived Jazz ;-)
Conclusion: to get you started in the game after leadsheets and as 'supplementary' for the 5th edition, it is ok. For the first session but it is not recommended.