Spectacular
Respighi, Ancient Airs and Dances, Dorati conducting, on Mercury SRI 75009.
Rachmaninoff, Rhapsody on a Theme of Paganini, Rubinstein and Reiner, Living Stereo LSC-2430.
Brooding, Threatening, and Deep
Gorecki, Symphonie No 3, Woytowicz (soprano), Bour (conductor). Released as a sound track of the movie 'Police', Erato ERA 9275. Surprise!
Extra-Terrestrial
Tallis, Spem in Alium, a 40 (forty) part harmony, half of Side 2 of 'The Glories of Tudor Church Music'. The Clerkes of Oxenford, Wulstan (director), Music for Pleasure (aka Classics for Pleasure) (EMI) CFP 40069. Note the stylized line integral symbol on the upper right.
Hykes, Hearing Solar Winds, The Harmonic Choir, Ocora 558 607. Modern composition performed in a medieval stone church, using Tibetan techniques to sing in chords. Named Best Classical Record of 1982, IIRC.
Good luck! And GREAT question!