With no explanation, label each line with "organization-showorganization", "O", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart", "building-airport" or "building-hospital" preceded by ":".
He
is
the
principal
timpanist
of
the
Boston
Symphony
Orchestra
,
a
position
he
has
held
since
2003
.
He:O
is:O
the:O
principal:O
timpanist:O
of:O
the:O
Boston:organization-showorganization
Symphony:organization-showorganization
Orchestra:organization-showorganization
,:O
a:O
position:O
he:O
has:O
held:O
since:O
2003:O
.:O