What sends shivers down your spine when you play it on your system?

Good stuff!   Taking notes.....

Schubert any particular recording of “The Lark Ascending”?

Btw people often ponder if you need a good hifi to enjoy music.  Probably not but definitely helps when in search of  shiver down your spine moments. 

Horrors!  Yes, typo, Mahler 5.  Must proof-read more carefully...
@newbee  If you don't already have it, the 2CD expanded version of Live at Blues Alley entitled Nightbird, to me sounds even better than the original release, plus there's a bunch of additional material. 

mapman,
My first choice is Hugh Beam with Boult, the original conductor ." The Essential Vaughan Williams" on Warner classic

Very close is the great Scottish violinist  (never mind her name} Nicola Benedetti with Andrew Litton - forget the label but easy to find .

Iona Brown with Neville Marriner on Argo is also a heart breaker .