Here are some links that you may find helpful:

US MILITARY BANDS:

U.S. Marine Corps Band – http://www.marineband.usmc.mil
U.S. Navy Band – http://www.navyband.navy.mil
U.S. Army Band – http://www.army.mil/armyband
U.S. Air Force Band – http://www.usafband.com

PROFESSIONAL GROUPS:

Pacific Symphony – http://www.pacificsymphony.org
San Diego Symphony – http://www.sandiegosymphony.com
San Diego Chamber Orchestra – http://www.sdco.org
Los Angeles Philharmonic and Walt Disney Concert Hall – http://wdch.laphil.com
Los Angeles Chamber Orchestra – http://www.laco.org
The Dallas Wind Symphony – http://www.dws.org
The Tokyo Kosei Wind Orchestra - http://www.tkwo.jp/english/index.html

MUSIC SCHOOLS:

CSU Fullerton – http://www.fullerton.edu/arts/music
CSU Long Beach – http://www.csulb.edu/~music/
University of Redlands - http://www.redlands.edu/x26640.xml
San Diego State University – http://music.sdsu.edu
UCLA – http://www.music.ucla.edu
USC – Thornton School of Music - http://www.usc.edu/schools/music
Indiana University Jacobs School of Music – http://music.indiana.edu

ORGANIZATIONS:

The National Association for Music Education – http://www.menc.org
The California Association for Music Education – http://www.calmusiced.org
Winter Guard Association of Southern California – http://www.wgasc.org
Drum Corps International – http://www.dci.org
Winter Guard International – http://www.wgi.org

WOODWIND RESOURCES:

Flute.com – http://www.flute.com
National Flute Association – http://www.nfaonline.org
International Double Reed Society – http://www.idrs.org
International Clarinet Association – http://www.clarinet.org
International Saxophone Association – http://www.saxophone.org

BRASS RESOURCES:

International Trumpet Guild – http://www.trumpetguild.org
International Horn Society – http://www.hornsociety.org
International Trombone Association – http://www.ita-web.org
International Tuba Euphonium Association – http://www.iteaonline.org

PERCUSSION RESOURCES:

Percussive Arts Society – http://www.pas.org