For the newbies, the term octave indeed seems alien. You have probably come across it during your music lessons. In music, the octave represents an interval where the higher note features a sound-wave frequency with a greater vibration than its lower note.
Therefore, the international set pitch A over middle C shakes at 440 hertz (rounds per second). Above the A chord, the octave has a vibration of 880 hertz, while the lower octave has one of 220 hertz.
Now, you might wonder how many octaves are there actually. Do not fret, as we are here to help you with that. You will get to know how many octaves does a piano, ukulele, and a guitar has.
Without further ado, let's dive in!
What is an Octave?
As we mentioned before, an octave is nothing but a musical interval. It can be defined both in terms of physics and of music.
In physics, an octave is a distance between two notes, one having 2x of a frequency than the other. For instance, the A4 note is the sound of a tremor at 440 Hz, and the A5 note is the noise of a tremor at 880 Hz. Moving in the other direction, the sound at 220 Hz is that of an A3 note.
In musical terms, the distance between a note (like C#) and the following note has the same name (the next C# higher or lower).
In most diagrams, it represents a C major scale, where the music increases from middle C or the C4 (this is the pitch C in the fourth octave on a piano) to note C5, an octave above the former one.
The C4 has a vibration of 261.63 Hz, and the C5 has a beat of 523.25 Hz – you can see that C5 has sound waves with double the frequency.
How to divide an Octave?
Octaves are linked in 12 equal intervals in any Western music. Each of the 12 equal intervals leads to a new note, which is as follows:
Depending on which key we are in, the notes that have slashes can also be called by either name. For example, the note F# is located in the D's key, and it is the 3rd interval in this D major scale.
Due to some rules of the music theory, however, the Eb minor and Eb minor scale key have the same exact pitch as that of Gb.
Below is how the notes permit you to move stepwise – down or up an octave.
If we move up/down by an interval at one time, like starting from the note G note till the note Ab, you will be advancing in semitones (also called half steps).
If we move up/down by 2 intervals simultaneously, like from note G to note A, you will advance in whole tones (also called whole steps).
How Many Octaves are in Music?
With every octave, the frequency of sound doubles. If you consider starting from the lowest audible note, C note "C0", it has a frequency of 16.35 Hz.
You should know that this is much lower than the lowest note of a piano and just an iota lower than the human audible range limit.
Middle C has 4 octaves up, at 261.63 Hz or "C4." Just multiply the 16.35 Hz by four to get this. Keep on doubling octave by octave till you finally reach "C8", which is the highest C on the piano. It has a frequency of 4.2 kHz or 4186.01 Hz.
Ultimately, you begin approaching the human auditory range's boundaries with "C10", which is at 16.7 kHz or 16744.04 Hz, just 10 octaves more than our starting note.
How many Octaves does a Guitar have?
Learning how to play the guitar usually begins with learning its octaves. You must know how many octaves a guitar has by merely counting them.
Even though most guitars have a somewhat special design, most guitars boast around 4 octaves. This a rounded-up figure. Usually provided as fractions, the number of actual octaves heavily relies on the number of frets and strings, given that the tuning is done.
For instance, a 7-string guitar will feature a greater number of octaves than a 6-string guitar, just like the case for the guitars with more frets.
How many Octaves does a Ukulele have?
Without playing the actual chord, the sound can be made bigger with the help of octaves. Nowadays, ukuleles also have integrated octaves in them.
You will see that a standard re-entrant ukulele has up to 2 octaves, from C4 to A5 at the 12th fret or to C6 at the 15th fret (if your ukulele has one).
To do this, you have to attach a low-G string beginning at G3. Later you can go up to F6 on the concert/tenor ukulele – these have 20 frets.
How many Octaves does a Piano have?
Generally, a piano features 7 and ¼ octaves. This is applicable for a modern grand, uptight, or digital piano. By 7 and ¼, we mean that it has 7 full octaves and 3 extra treble notes – B, B-flat, and C.
In digital instruments, there can be variations of the octaves.
How many Octaves can a Human Ear Detect?
Since all the waveforms are complimentary, all octaves will harmonize. Giving you around 10 octaves, the human range of 20 Hz – 20,000 Hz will provide you with about 10 octaves.
Below 10 Hz, all you hear is considered to be rhythms. If you would like to include them as well, you will get 4 extra octaves, making a total of 14 octaves.
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That's a wrap on how many octaves there are. We hope this article answers all your questions about octaves.
For your ease, we have also mentioned the octaves of different instruments. Give this a read again for better understanding!
You can also read our guide on How to Record in Audacity While the Track is Playing.