Album: The Pat Metheny Group (called the "white album" because of its plain white cover with just the four names of the players). Side one of the LP was just "San Lorenzo" and "Phase Dance". The former still gives me chills, 40 years later.
Song: Wildflower, by Skylark (fun fact: David Foster was a member). Here[0] is a live version. Here[1] is the background story.
Honorable mention: Hoptsoi, by the Finnish group Värttinä. OMG, the strings. [2]