Among some of the nations of the Orient, music and harmony was not approved of, but the Manifested Light, Bahá’u’lláh, in this glorious period has revealed in Holy Tablets that singing and music are the spiritual food of the hearts and souls. In this dispensation, music is one of the arts that is highly approved and is considered to be the cause of the exaltation of sad and desponding hearts.
Therefore ... set to music the verses and the divine words so that they may be sung with soul-stirring melody in the Assemblies and gatherings, and that the hearts of the listeners may become tumultuous and rise towards the Kingdom of Abhá in supplication and prayer.
Thank thou God that thou art instructed in music and melody, singing with pleasant voice the glorification and praise of the Eternal, the Living. I pray to God that thou mayest employ this talent in prayer and supplication, in order that the souls may become quickened, the hearts may become attracted and all may become inflamed with the fire of the love of God!
...although sound is but the vibrations of the air which affect the tympanum of the ear, and vibrations of the air are but an accident among the accidents which depend upon the air, consider how much marvelous notes or a charming song influence the spirits! A wonderful song giveth wings to the spirit and filleth the heart with exaltation....
The utmost joy was attained, for—praise be to God!—the friends of the Merciful passed some time on that day joyous and singing in the land of the Mashrak-el-Azcar and enjoyed commemorating the Lord of the verses with the greatest joy....
I am hopeful that, during the coming Rizwan1, a great feast shall be held in the land of the Mashrak-el-Azcar, a spiritual celebration prepared and the melodies of the violin and the mandolin and hymns in praise and glorification of the Lord of Hosts make all the audience joyous and ecstatic.
O servant of Bahá! Music is regarded as a praiseworthy science at the Threshold of the Almighty, so that thou mayest chant verses at large gatherings and congregations in a most wondrous melody and raise such hymns of praise at the Mashriqu’l-Adhkár to enrapture the Concourse on High. By virtue of this, consider how much the art of music is admired and praised. Try, if thou canst, to use spiritual melodies, songs and tunes, and to bring the earthly music into harmony with the celestial melody. Then thou wilt notice what a great influence music hath and what heavenly joy and life it conferreth. Strike up such a melody and tune as to cause the nightingales of divine mysteries to be filled with joy and ecstasy.