With no explanation, label each line with "O", "person-other", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
It
is
played
in
the
background
while
Arthur
rides
on
a
horse
back
to
his
camp
at
a
pivotal
moment
in
the
game
's
story
.
It:O
is:O
played:O
in:O
the:O
background:O
while:O
Arthur:person-other
rides:O
on:O
a:O
horse:O
back:O
to:O
his:O
camp:O
at:O
a:O
pivotal:O
moment:O
in:O
the:O
game:O
's:O
story:O
.:O