Arvo Pärt - Alina
You can find all five tracks below in correct running order. Yes this music is very quiet, and yes the album has a symmetry to it.
A collection of Ralph Vaughan William pieces performed by the London Philharmonic Orchestra, conducted by Bryden Thomson:
Norfolk Rhapsody, In the Fen Country, Fantasia on a Theme by Thomas Tallis, and 5 Variants of 'Dives and Lazarus'
The names of these compositions may or may not mean much to some of you, but you might recognize some of them if you heard them, especially the Thomas Tallis piece. They are all rather pastoral plus this recording is rather lush, making it even more peaceful and serene.