Act II opens with a delightful duet for Agathe and Aennchen and a charmingly coquettish little air for the latter (Comes a comely youth a-wooing). Then comes Agathe's principal scene. She opens the window and, as the moonlight floods the room, intones the prayer so simple, so exquisite, so expressive: "Leise, leise, fromme Weise" (Softly sighing, day is dying).
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This is followed, after a recitative, by a rapturous, descending passage leading into an ecstatic melody: "Alle meine Pulse schlagen" (All my pulses now are beating) as she sees her lover approaching.
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The music of the Wolf's Glen scene long has been considered the most expressive rendering of the gruesome that is to be found in a musical score. The stage apparatus that goes with it is such that it makes the young sit up and take notice, while their elders, because of its naïveté, are entertained. The ghost of Max's mother appears to him and strives to warn him away. Cadaverous, spooky-looking animals crawl out from caves in the rocks and spit flames and sparks. Wagner got more than one hint from the scene. But in the crucible of his genius the glen became the lofty Valkyr rock, and the backdrop with the wild hunt the superb "Ride of the Valkyries," while other details are transfigured in that sublime episode, "The Magic Fire Scene."
After a brief introduction, with suggestions of the hunting chorus later in the action, the third act opens with Agathe's lovely cavatina, "And though a cloud the sun obscure." There are a couple of solos for Aennchen, and then comes the enchanting chorus of bridesmaids. This is the piece which Richard Wagner, then seven years old, was playing in a room, adjoining which his stepfather, Ludwig Geyer, lay in his last illness. Geyer had shown much interest in the boy and in what might become of him. As he listened to him playing the bridesmaids' chorus from "Der Freischütz" he turned to his wife, Wagner's mother, and said: "What if he should have a talent for music?"
In the next scene are the spirited hunting chorus and the brilliant finale, in which recurs the jubilant melody from Agathe's second act scene.
The overture to "Der Freischütz" is the first in which an operatic composer unreservedly has made use of melodies from the opera itself. Beethoven, in the third "Leonore" overture, utilizes the theme of Florestan's air and the trumpet call. Weber has used not merely thematic material but complete melodies. Following the beautiful passage for horns at the beginning of the overture (a passage which, like Agathe's prayer, has been taken up into the Protestant hymnal) is the music of Max's outcry when, in the opera, he senses rather than sees the passage of Zamiel across the stage, after which comes the sombre music of Max's air: "Hatt denn der Himmel mich verlassen?" (Am I then by heaven forsaken?). This leads up to the music of Agathe's outburst of joy when she sees her lover approaching; and this is given complete.