A second installment of the (jazz) arranger/composer special. The first one was about arrangers working to the strengths of a specific performer. These two are more about the composition; it's the performers that come to play with the mastermind.
George Russell is the mastermind behind the first album. He passed away in mid-2009; here's a well-written obituary detailing his accomplishments. While not a household name, Russell was very influential among his contemporaries. Many (including Miles Davis) point to his theoretical work as a cornerstone of the modal jazz. His book, Lydian Chromatic Concept of Tonal Organization, is legendary among the jazz musicians - among other things, for being so densely written as to be nearly unreadable. The excellent Casa Valdez Studios has a discussion of his theories - see if you can make more sense of it than I did.
Russell had no trouble assembling an all-star cast for his albums; this one is the first he recorded under his own name and it has Art Farmer on trumpet (again!) and Bill Evans on piano. Don Ellis and Eric Dolphy play on his next, Ezz-thetics, possibly even more fascinating, although somewhat less accessible album.
George Russell - The Jazz Workshop 
With Art Farmer, Bill Evans, Paul Motian, and others.
256kbps, 103mb on depositfiles
1. Ye Hypocrite, Ye Beelzebub
2. Jack's Blues
3. Livingstone I Presume
5. Night Sound
6. Round Johnny Rondo
7. Fellow Delegates
8. Witch Hunt
9. The Sad Sergeant
10. Knights Of The Steamtable
11. Ballad Of Hix Blewitt
12. Concerto For Billy The Kid
13. Ballad Of Hix Blewitt (Alternate Take)
14. Concerto For Billy The Kid (Alternate Take)
Another album that fits the arranger/composer theme is Oliver Nelson's Blues and the Abstract Truth. It is probably the best-known of all of the above, and also well-represented in the share-o-sphere, so I will leech the links instead of uploading it.
Read a review: a landmark of jazz orchestration, one of the most potent modern jazz sextets ever (Freddie Hubbard, Eric Dolphy, Bill Evans)
Oliver Nelson - The Blues and the Abstract Truth ()
Three links here or get it on rapidshare or mediafire; also available in FLAC
01. Stolen Moments
05. Butch and Butch
06. Teenie’s Blues