Read the poem “Serenade,” by Edgar Allan Poe.So sweet the hour, so calm the time,I feel it more than half a crime,When Nature sleeps and stars are mute,To mar the silence ev'n with lute.At rest on ocean's brilliant dyesAn image of Elysium lies:Seven Pleiades entranced in Heaven,Form in the deep another seven:Endymion nodding from aboveSees in the sea a second love.Within the valleys dim and brown,And on the spectral mountain's crown,The wearied light is dying down,And earth, and stars, and sea, and skyAre redolent of sleep, as IAm redolent of thee and thineEnthralling love, my Adeline.But list, O list,- so soft and lowThy lover's voice tonight shall flow,That, scarce awake, thy soul shall deemMy words the music of a dream.Thus, while no single sound too rudeUpon thy slumber shall intrude,Our thoughts, our souls- O God above!In every deed shall mingle, loveWhat is the theme of the poem?