Probably, radio or television shows have you not heard: "Is the Adagio from Tchaikovsky's ballet "Sleeping beauty". "Is the Adagio from the ballet Glazunov Raymonda". What does this mean?
Adagio is an Italian word that translates as "slowly, quietly". However, in music, the word takes on much more profound meaning. It indicates not only the rate, i.e. the speed of execution, but speaks of the character of the music - concentration, deep meditation.
Often the word Adagio represent one of the major parts of a work for Symphony orchestra or any instrument.
Probably not in the world who loves music, who would not know the "Moonlight Sonata" by Beethoven. And everyone remembers the wonderful, deeply stirring melody of the first part, the melody, full of indescribable beauty, floating above the rhythmically swaying accompaniment. Beethoven called this part of the Adagio.
Ludwig van Beethoven. Sonata No. 14 for piano "moon".
Part 1 - Adagio sostenuto
And the word ballet Adagio called lyrical duet of the main characters. Music ballet Adagio usually has a broad, responsive melody, romance character.
P. I. Tchaikovsky. Adagio from the ballet "Sleeping beauty"