With no explanation, label each line with "product-other", "O", "person-artist/author", "art-broadcastprogram", "art-film", "art-music", "art-other", "art-painting", "art-writtenart" or "building-airport" preceded by ":".
Richard
bought
a
Wurlitzer
electric
piano
as
an
additional
instrument
to
complement
his
acoustic
piano
onstage
.
Richard:person-artist/author
bought:O
a:O
Wurlitzer:product-other
electric:O
piano:O
as:O
an:O
additional:O
instrument:O
to:O
complement:O
his:O
acoustic:O
piano:O
onstage:O
.:O