The names of the 
2010 MacArthur Fellows have been released, and there are two musicians on the list! 
Jason Moran is a jazz pianist / composer, and 
Sebastian Ruth is a violist, violinist, and music educator.  (Both men are 35 years old and live on the east coast.  It's a coincidence.)  
You want a list all of the music-related MacArthur Fellows who have ever existed?  Okay.
Marin Alsop   - Orchestra Conductor
Milton Babbitt  - Composer
Ran Blake  - Composer and Pianist  
Anthony Braxton - Jazz Composer and Performer
Regina Carter  - Jazz Violinist
Ornette Coleman - Jazz Performer and Composer
John C. Eaton  - Composer
Osvaldo Golijov - Composer
John Harbison  - Composer and Conductor
Corey Harris  - Blues Musician
Stephen Hough  - Pianist
Peter Jeffery   - Musicologist
Bernice Johnson Reagon - Music Historian, Composer, and Vocalist
Leila Josefowicz - Violinist
Ali Akbar Khan  - Classical Indian Music Performer
Walter Kitundu  - Instrument Maker and Composer
Steve Lacy  - Saxophonist and Jazz Composer
George E. Lewis - Composer, Performer, and Music Theorist
Susan McClary  - Musicologist
Edgar Meyer  - Bassist and Composer
Conlon Nancarrow - Composer
George Perle  - Composer and Music Theorist
Max Roach  - Percussionist and Jazz Composer
Reginald Robinson - Ragtime Pianist and Composer
Alex Ross   - Music Critic
George Russell  - Composer and Music Theorist
Gunther Schuller - Composer, Conductor, and Jazz Historian
Ralph Shapey  - Composer and Conductor
Bright Sheng  - Composer
Cecil Taylor  - Jazz Pianist and Composer
Gary A. Tomlinson - Musicologist
Dawn Upshaw  - Vocalist
Ken Vandermark  - Jazz Composer and Performer
Marion Williams - Gospel Music Performer
Charles Wuorinen - Composer
Miguel Zenón  - Saxophonist
John Zorn  - Musician and Composer