This page illustrates some of the instruments that make up the symphony orchestra.  A typical marching or concert band is quite different-there are no string instruments in a concert band. (Did you ever see a marching violinist?)  More emphasis is placed on the brass instrument section in a concert band, as well as the percussion section
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http://www.rlcraig.org/~joseph_brice/00092F48-00757F32.0/trombone.gif      http://www.rlcraig.org/~joseph_brice/00092F48-00757F32.1/trumpet-2.gif        http://www.rlcraig.org/~joseph_brice/00092F48-00757F32.2/tuba-60.gif           
         TROMBONE                                                TRUMPET                                          TUBA

http://www.rlcraig.org/~joseph_brice/00092F48-00757F32.3/silver-flute-6.gif                    http://www.rlcraig.org/~joseph_brice/00092F48-00757F32.4/children-violin-and-case.gif
 
            FLUTE                                                          VIOLIN

harp-3.gif
                                                                   HARP