A semitone is the distance between a node and its nearest one on a keyboard. It can also be named as half step. Here we know the pitch is the difference between two notes. So semitones can be explained in terms of pitch. Semitones are called the smallest interval in western music. In a 12-note approximately equally divided scale, any interval can be defined in terms of an appropriate number of semitones. They are a whole tone or major second is 2 semitones wide, a major third 4 semitones, and a perfect circle of fifth 7 semitones. The whole tone is just twice the size of a half-step/ semitone.
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Accidental, in music is just the opposite concept of the term accident. An accident occurs unintentionally, whereas accidental in music is deliberate. It is a sign of music notation that increases or diminishes a natural note by one or two half steps. These are the special symbols that can be placed before the signature notes to raise or lower them, to create a difference. They are a note or pitch that is not part of the key signature.
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In making music most important three aspects are Beat, Tempo & Rhythm. All three play a vital role in making complete music. Music can be any type any genre but all three are important. We are all very much familiar with this term. But while many people are familiar with these terms, some still struggle to understand the difference between the most fundamental of musical elements—tempo and rhythm.
Definition
LFO doesn’t create sound or music. It can only modify a few parameters of sound. It can bend with a low frequency. Low-frequency oscillation (LFO) is clearly expressible a low level of sound generally below 20Hz. This LFO changes the sound produced by the original Oscillator. We use Hertz (Hz) to express Frequency . 1 Hz means one cycle per second. 100 Hz = 100 cycles-per-second. LFO can regulate the sound of oscillators at a slower rate. Generally, the slow rate is 10Hz or less. That means, the LFO varies 10 times per second or slower.

An oscillator may be a repetition wave shape with a fundamental and peak amplitude. It forms the bottom of contemporary synthesis techniques. These square measure the fundamental parts & factors of a synth sound. Oscillators square measure wont to check electronic circuits, transmit radio signals, and supply integrative material within the production of electronic and sound synthesis.