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 ":".
His
appearance
as
a
substitute
for
the
ailing
Igor
Markevitch
in
1961
featured
arias
by
Giuseppe
Verdi
as
sung
by
his
wife
Marilyn
Horne
.
His:O
appearance:O
as:O
a:O
substitute:O
for:O
the:O
ailing:O
Igor:person-other
Markevitch:person-other
in:O
1961:O
featured:O
arias:O
by:O
Giuseppe:person-other
Verdi:person-other
as:O
sung:O
by:O
his:O
wife:O
Marilyn:person-other
Horne:person-other
.:O