<s>
RjDj	B-Application
(	O
Reality	O
Jockey	O
Ltd	O
.	O
)	O
was	O
a	O
startup	O
founded	O
in	O
late	O
2008	O
by	O
last.fm	B-Application
co-founder	O
Michael	O
Breidenbruecker	O
.	O
</s>
<s>
RjDj	B-Application
produced	O
and	O
distributed	O
a	O
network	O
of	O
mobile	O
applications	O
and	O
sold	O
additional	O
musical	O
content	O
within	O
this	O
network	O
.	O
</s>
<s>
RjDj	B-Application
developed	O
a	O
new	O
genre	O
of	O
music	O
that	O
it	O
called	O
reactive	O
music	O
,	O
a	O
non-linear	O
form	O
of	O
music	O
that	O
was	O
able	O
to	O
react	O
to	O
the	O
listener	O
and	O
their	O
environment	O
in	O
real-time	O
.	O
</s>
<s>
Reactive	O
music	O
is	O
closely	O
connected	O
to	O
generative	B-Application
music	I-Application
,	O
interactive	O
music	O
,	O
and	O
augmented	B-General_Concept
reality	I-General_Concept
.	O
</s>
<s>
camera	O
,	O
microphone	B-Application
,	O
accelerometer	O
,	O
touch-screen	B-Device
and	O
GPS	O
)	O
in	O
mobile	O
media	O
players	O
.	O
</s>
<s>
The	O
main	O
difference	O
to	O
generative	B-Application
music	I-Application
is	O
that	O
listeners	O
are	O
part	O
of	O
the	O
creative	O
process	O
,	O
co-creating	O
the	O
music	O
with	O
the	O
composer	O
.	O
</s>
<s>
Applications	O
made	O
by	O
RjDj	B-Application
were	O
available	O
on	O
Apple	O
’s	O
iOS	B-Application
platform	O
.	O
</s>
<s>
The	O
technology	O
behind	O
it	O
was	O
based	O
on	O
the	O
Pure	B-Language
Data	I-Language
(	O
or	O
Pd	O
)	O
digital	O
signal	O
processing	O
framework	O
.	O
</s>
<s>
RjDj	B-Application
closed	O
its	O
website	O
and	O
removed	O
its	O
apps	O
from	O
circulation	O
in	O
2013	O
.	O
</s>
