Sound is
produced
when
an
object
____________________
and
it
is
what
can
be
perceived
by
a
living
organism
through
its
sense
of
____________________
.
It
travels
through
physical
mediums
by
sound
____________________
and
it
is
normally
a
____________________
____________________
.
Sound
propagates
at
high
speeds
.
The
waves
travel
through
the
air
at
____________________
meters
per
second
.
Sounds
are
picked
up
by
a
very
thin
____________________
in
our
ear
,
the
____________________
,
which
connects
the
outer
and
middle
ear
.
When
sound
waves
hit
the
eardrum
,
the
information
produced
by
its
vibration
is
transmitted
to
the
brain
by
means
of
____________________
____________________
.
Finally
,
silence
is
the
____________________
hearing
sensation
.
Actually
,
there
isn´t
such
a
thing
as
absolute
silence
.
Even
if
we
could
isolate
ourselves
completely
from
outer
sounds
,
we
would
still
hear
our
own
body´s
inner
sounds
.
There
are
____________________
basic
qualities
:
____________________
(
____________________
)
which
differentiates
beetwen
a
low
sound
and
a
high
sound
.
____________________
(
____________________
.
)
which
differentiates
beetwen
a
short
sound
and
a
long
sound
.
____________________
(
____________________
)
which
differentiates
beetwen
a
forte
sound
and
a
piano
sound
.
____________________
(
____________________
)
that
tells
you
what
kind
of
sound
you
are
listening
to
.
To
represent
the
____________________
we
use
the
staff
,
the
clef
and
the
notes
.
The
____________________
is
written
as
five
horizontal
parallel
lines
.
Most
of
the
notes
of
the
music
are
placed
on
one
of
these
lines
or
in
a
space
between
lines
.
Extra
____________________
____________________
may
be
added
to
show
a
note
that
is
too
high
or
too
low
to
be
on
the
staff
.
The
duration
of
a
sound
is
indicated
using
several
____________________
.
In
standard
notation
,
a
single
musical
sound
is
written
as
a
____________________
.
To
represent
the
intensity
we
use
the
____________________
.
The
term
piano
(
p
)
is
used
to
indicate
____________________
and
forte
(
f
)
to
indicate
____________________
.
Also
included
in
dynamics
are
the
____________________
(
gradually
increasing
intensity
)
,
____________________
(
gradually
decreasing
intensity
)
and
the
____________________
(
sudden
loudness
)
.
There
are
some
V
-
shaped
symbols
,
called
____________________
,
which
represent
a
gradual
or
progressive
intensity
change
.
Timbre
is
the
____________________
of
the
sound
and
it
is
caused
by
the
fact
that
each
note
from
a
musical
instrument
is
a
complex
wave
containing
more
than
one
frequency
.
For
instruments
that
produce
notes
with
a
clear
and
specific
pitch
,
the
secondary
frequencies
that
are
involved
in
the
sound
are
called
____________________
.
The
human
ear
and
brain
are
capable
of
hearing
and
appreciating
very
small
variations
in
timbre
.
