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 ":".
Their
albums
often
feature
ancient
instruments
such
as
medieval
flute
,
hammer
dulcimer
and
Appalachian
dulcimer
played
by
Alessandra
and
Francesco
.
Their:O
albums:O
often:O
feature:O
ancient:O
instruments:O
such:O
as:O
medieval:O
flute:product-other
,:O
hammer:product-other
dulcimer:product-other
and:O
Appalachian:product-other
dulcimer:product-other
played:O
by:O
Alessandra:person-artist/author
and:O
Francesco:person-artist/author
.:O