<s>
Igor	B-Application
Engraver	I-Application
is	O
a	O
scorewriter	O
for	O
the	O
Macintosh	B-Device
and	O
Windows	B-Application
operating	I-Application
systems	I-Application
,	O
created	O
by	O
Swedish	O
composer	O
Peter	O
Bengtson	O
and	O
published	O
by	O
the	O
Swedish	O
company	O
NoteHeads	O
.	O
</s>
<s>
Despite	O
delays	O
in	O
publishing	O
the	O
first	O
version	O
,	O
Igor	B-Application
Engraver	I-Application
was	O
widely	O
praised	O
for	O
its	O
unprecedented	O
ease	O
of	O
use	O
and	O
revolutionary	O
user	O
interface	O
.	O
</s>
<s>
(	O
This	O
feature	O
first	O
appeared	O
in	O
the	O
notation	O
program	O
Composer	O
's	O
Mosaic	O
,	O
but	O
Igor	O
's	O
is	O
one	O
of	O
the	O
earliest	O
implementations	O
,	O
well	O
before	O
those	O
of	O
Sibelius	B-Device
and	O
Finale	B-Application
.	O
)	O
</s>
<s>
Igor	O
is	O
written	O
almost	O
entirely	O
in	O
the	O
Lisp	B-Language
programming	I-Language
language	I-Language
.	O
</s>
<s>
For	O
a	O
short	O
time	O
,	O
Igor	O
was	O
released	O
as	O
freeware	B-License
with	O
the	O
hope	O
that	O
online	O
sales	O
of	O
scores	O
would	O
finance	O
it	O
.	O
</s>
