All 3 Uses

symphony
in
Leaves of Grass
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4
I hear those odes, symphonies, operas,
I hear in the William Tell the music of an arous'd and angry people,
I hear Meyerbeer's Huguenots, the Prophet, or Robert,
Gounod's Faust, or Mozart's Don Juan.†
Chpt 25
I hear the annual singing of the children in St. Paul's cathedral,
Or, under the high roof of some colossal hall, the symphonies,
oratorios of Beethoven, Handel, or Haydn,
The Creation in billows of godhood laves me.†
Chpt 25
After the Dazzle of Day
After the dazzle of day is gone,
Only the dark, dark night shows to my eyes the stars;
After the clangor of organ majestic, or chorus, or perfect band,
Silent, athwart my soul, moves the symphony true.†
Chpt 34 *

Definitions:

(1) (symphony)
a long, complex piece of music for full orchestra (often in several movements); also, the orchestra or performance of such a work, or by extension any richly harmonious combination of many parts
(2) (meaning too rare to warrant focus)