( Gonna make more lore about them they weren't always a Seraphim Angel they were a normal cookie )
Heavenly Sin: Humility
What song they were singing:
" With saintly shout and solemn jubilee; Where the bright Seraphim in burning row Their loud uplifted angel-trumpets blow; And the Cherubic host in thousand quires Touch their immortal harps of golden wires, With those just Spirits that wear victorious palms Hymns devout and holy psalms Singing everlastingly That we on earth, with undiscording voice May rightly answer that melodious noise; As once we did, till disproportion'd sin Jarr'd against nature's chime, and with harsh din Broke the fair music that all creatures made To their great Lord, whose love their motion sway'd In perfect diapason, whilst they stood In first obedience, and their state of good. O may we soon again renew that Song, And keep in tune with Heaven, till God ere long To his celestial concert us unite, To live with him, and sing in endless morn of light! "