The Realms of Aorlis Fantasy Setting

Songs that feel epic or imagery-inducing to me. Mileage may vary, and I'm sure everyone has a personal list of songs that affect them deeply.  

O Fortuna--Carmina Burana by Carl Orff

Cowgirl in the Sand by Neil Young

Wizard's Birthday by Uriah Heap

Hotel California by the Eagles

For a Few Dollars More by Ennio Moriccone

Dead Man Soundtrack by Neil Young

Millennium TV Theme by Mark Snow

Tubular Bells by Mike Oldfield

War of the Worlds by Jeff Wayne

It's interesting to note that these songs are not medieval, but the feelings they engender can be very profound. The book I'm writing currently rings with the notes of For a Few Dollars More, as an example.