In an orchestral setting, the concert bass drum plays an integral role in the overall feel of a piece of music. In orchestral literature, the bass drum usually deals more with coloring and shading the sounds of the orchestra as opposed to providing a solid, rhythmic foundation like in marching and drumset. The bass drum is usually used to accent strong points in the music and is often combined with a cymbal crash to further accentuate the moment. In fact, the two instruments are used in conjunction so often that many parts simply contain one rhythm and the composer then indicates which instruments are to play at which points.
Though the bass drum is possibly the least frequently requested instrument at auditions, it actually takes a fair amount of skill to play correctly. Given the number of variables that can change when playing the bass drum (beater, beating location, amount/type of muffling, stroke, etc.), a well-versed percussionist is usually required in order to obtain all the possible sounds from the instrument.
Some important excerpts for the bass drum in orchestral literature include Stravinsky's The Rite of Spring, Tchaikovsky's Symphony No. 4, Romeo and Juliet, and 1812 Overture, many of the Mahler symphonies (most notably his third), and Symphonie Fantastique by Hector Berlioz.
The snare drum is one of the most easily recognizable instruments in the entire percussion section. Also called the side drum, the snare drum is often used as a means of accenting rhythms from other families of instruments within the orchestra or as a soloistic type instrument, particularly in pieces that may have a "military" type theme or sound to them.