Mazzy Star - Fade Into You

They have other good music, but this track is purely wonderful. A height that I don't think they really approached with anything else.

Someday - Los Lobos

I can't find a video of it or a link, as no one knows what the **** it is. But it's used in the opening scene in A Love Song for Bobby Long, the excellent movie based off the excellent book Off Magazine Street by R.E. Capps.

PS. Loved JayJam's pick of Stuck In The Middle. I think that it's used in Resevoir Dogs (one of my faves) makes it all the more eligible for this list.

I Did a review of this album and came away feeling a similar way. Other stuff is good, but that hit song is a belt of a classic