Download Maths and music - Project Jugaad

GROUP MEMBERS ZION- PROJECT LEADER
 TYRESE-CHIEF RESEARCHER
 MUSKAN-COMMUNICATIONS DIRECTOR
 GHAZAL-DIGITAL ENGINEER
“Mathematics is involved
in some way in every field
of study known to
mankind. In fact, it could
be argued that
mathematics is involved
in some way in everything
that exists everywhere, or
even everything that is
imagined to exist in any
conceivable reality. Any
possible or imagined
situation that has any
relationship whatsoever to
space, time, or thought
would also involve
mathematics.”
Math is related to everything including music. Math
relates to the rhythm, keys, and tuning. When you are
listening to music, you count the beats. When you
play the piano, you can count the keys as numbers.
The piano needs to be constructed in a way so that
when the key is hit a specific frequency is given off
frequency is measured in hertz. The 'math' of rhythm
is about the time values (note lengths); whole, half,
quarter, eighth, sixteenth, just keep halving that and
you have the nearly the whole idea. The maths of
meter, time signatures, is one of simple fractions.
Music is a field of study that has an obvious
relationship to mathematics. Music is, to many
people, a nonverbal form of communication, that
reaches past the human intellect directly into the soul.
However, music is not really created by mankind, but
only discovered, manipulated and reorganized by
mankind. In reality, music is first and foremost a
phenomena of nature, a result of the principles of
physics and mathematics. Maths and music are
usually organized into two separate categories,
without obvious overlap.
Maths is everywhere and it is
a very important factor in
playing the piano. You need
rhythm and you need to count
the beats. The right hand has
to play 4 evenly spaced notes
in the same amount of time
the left plays 3, also spaced
evenly. So each note in the
right hand is played for one
fourth of the total interval,
while each note on the left is
played for one third of the
interval.
The ‘Math' of Intervals is the distance from one pitch
to another. Intervals are 'measured' by the number of
half steps between two pitches (the distance
between any key on the keyboard on the immediate
neighbour is a half step.) Knowing the number of
letter names and how many half-steps there are
between one note and another are what allow you
to determine the interval, and what 'quality,' it has,
i.e. major, minor, diminished, augmented. Learning
intervals is simply counting and memorizing, not
anywhere near a 'math function.‘ For acoustics, the
physics of sound, a much greater degree of maths is
involved. For general music reading, writing and
performing, the maths required are basic counting,
simple fractions and that is it.
You may have heard the maths / music point
exaggerated as if the combination of the two were a
key to understanding the universe.

One jumps out at you when you look at sheet
music is the time signature. Another is the tempo,
sometimes given as a metronome rate. Note
values are fractions (quarter, sixteenth), so a
dotted note means multiply the value by 1.5. These
things aren't very complicated, but they are right
out there in front.

A little less visible but even more important is the
matter of pitch. A pitch is created by a vibration. In
the case of your piano, middle A vibrates a string
440 times a second. Physicists call this a frequency
of 440 hertz, or 440 cycles per second.

If you go up an octave, you double the
frequency. Other intervals are other ratios.
Going up a fifth (from A to E) multiplies the
frequency by 3/2, so E is (about) 660 hertz.
The Greeks discovered that two strings
played together sounded pleasant if the
lengths of the strings were in ratios of small
whole numbers: 2:1 (octave), 3:2 (fifth), 4:3
(fourth), 5:4 (third).

The interval from A to E (a fifth), in equal tempering,
isn't exactly 3/2 = 1.5, but 2^(7/12) = 1.4983. (The "^"
represents an exponent.) The interval of a fourth
isn't 4/3 = 1.3333, but 2^(5/12) = 1.3348. The interval
of a third isn't 5/4 = 1.25, but 2^(4/12) = 1.2599. I
won't say exactly what equal tempering is, but you
might be able to figure it out from what I said,
depending on your math level. Equal tempering is
related to a "logarithmic scale."

Black keys on the piano are shown as sharps, e.g. the # on
the right of C represents C#, etc., and are shown only for the
highest octave. Each successive frequency change in the
chromatic scale is called a semitone and an octave has 12
semitones.

The word chord here means two notes whose frequency ratio
is a small integer. Except for multiples of these basic chords,
integers larger than about 10 produce chords not readily
recognizable to the ear.

The interval between C and G is called a 5th, meanings; the
second is a subset of the first. and the frequencies of C and
G are in the ratio of 2 to 3. The major third has four semitones
and the minor third has three. The number associated with
each chord, e.g. four in the 4th, is the number of white keys,
inclusive of the two end keys for the C-major scale, and has
no further mathematical significance. Note that the word
"scale" in "chromatic scale", "C-major scale", and
"logarithmic or frequency scale" has different meanings; the
second is a subset of the first.







|--Octave-CDEFGAB
1
|--5th-CDEF
2
|--4th-GAB
3
|-Maj.3rdC#D#
4
|-Min.3rdEF#
5
|
G#A#B
6
|
C
8
We can see from the " to an octave above that
a 4th and a 5th "add up and a major 3rd and a
minor 3rd "add up" to a 5th. Note that this is an
addition in logarithmic space. The missing integer
7.
The "equal tempered" (ET) chromatic scale consists of "equal" half-tone or
semitone rises for each successive note. They are equal in the sense that
the ratio of the frequencies of any two adjacent notes is always the same.
This property ensures that each note is the same as any other note
(except for pitch). This uniformity of the notes allows the composer or
performer to use any key without hitting bad dissonances. There are 12
equal semitones in an octave of an ET scale and each octave is an exact
factor of two in frequency. Therefore, the frequency change for each
semitone is given by
semitone12 = 2 or
semitone = 21/12 = 1.05946. . . . . . . . . . . . . . . . . .
This defines the ET chromatic scale and allows the calculation of the
frequency ratios of "chords" in this scale. How do the "chords" in ET
compare with the frequency ratios of the ideal chords? The comparisons
are shown in Table 2.2b and demonstrate that the chords from the ET
scale are extremely close to the ideal chords.
Ideal Chords versus the Equal Tempered Scale
Chord
Freq. Ratio
Eq. Tempered Scale Difference
Min.3rd:
6/5 = 1.2000
semitone3 = 1.1892
+0.0108
Maj.3rd:
5/4 = 1.2500
semitone4 = 1.2599
-0.0099
Fourth:
4/3 = 1.3333
semitone5 = 1.3348
-0.0015
Fifth:
3/2 = 1.5000
semitone7 = 1.4983
+0.0017
semitone12 = 2.0000
0.0000
Octave: 2/1 = 2.0000

You may not need to know the math behind
music, but it is truly important to you. Music sounds
good to us because of its mathematical patterns rhythms and pitches - and math has been used
over the years to make music sound better. Math
and music belong together.
Made byZion
Tyrese
Ghazal
Abdullah
Muskan Sethi