You searched for ‘mellow calming pensive’, which matched 1 song. click - person recommending, year, performer, songtitle - to see more recommendations.
personally, i enjoy this song in a large part because of the story it tells. i would really like for this to happen to me... it's just a very poignant thing. as to the mechanics of the song, however, some gentle strumming and a bit of classical guitar-style picking lends to the mellow and comforting quality of this song (and the whole album).
from Quiet is the New Loud, available on CD (Astralworks)
FCS: I like this song also, both because of lyrics and melody. And I suggest you check out Royksopp's remix of this song