<s>
Harmony	B-Language
Compiler	I-Language
was	O
written	O
by	O
Peter	O
Samson	O
at	O
the	O
Massachusetts	O
Institute	O
of	O
Technology	O
(	O
MIT	O
)	O
.	O
</s>
<s>
The	O
compiler	O
was	O
designed	O
to	O
encode	O
music	O
for	O
the	O
PDP-1	B-Device
and	O
built	O
on	O
an	O
earlier	O
program	O
Samson	O
wrote	O
for	O
the	O
TX-0	B-Device
computer	O
.	O
</s>
<s>
Jack	O
Dennis	O
noticed	O
and	O
had	O
mentioned	O
to	O
Samson	O
that	O
the	O
sound	O
on	O
or	O
off	O
state	O
of	O
the	O
TX-0	B-Device
'	O
s	O
speaker	O
could	O
be	O
enough	O
to	O
play	O
music	O
.	O
</s>
<s>
They	O
succeeded	O
in	O
building	O
a	O
WYSIWYG	B-Application
program	O
for	O
one	O
voice	O
before	O
or	O
by	O
1960	O
.	O
</s>
<s>
For	O
the	O
PDP-1	B-Device
which	O
arrived	O
at	O
MIT	O
in	O
September	O
1961	O
,	O
Samson	O
designed	O
the	O
Harmony	B-Language
Compiler	I-Language
which	O
synthesizes	O
four	O
voices	O
from	O
input	O
in	O
a	O
text-based	O
notation	O
.	O
</s>
<s>
PDP-1	B-Device
music	O
is	O
merged	O
from	O
four	O
channels	O
and	O
played	O
back	O
in	O
stereo	O
.	O
</s>
<s>
Samson	O
joined	O
the	O
PDP-1	B-Device
restoration	O
project	O
at	O
the	O
Computer	O
History	O
Museum	O
in	O
2004	O
to	O
recreate	O
the	O
music	O
player	O
.	O
</s>
