The consecutive arrangement of a series of Music notes, such as a-b-c, without skipping any letters, is called "Step".
A step is the movement between music notes of various pitches in music theory.
In Western music, a half step, often known as a semitone, is the shortest interval between notes.
Directly adjacent notes, such as E and F, or A sharp and B, are a half step apart. One full step is equivalent to two half steps.
Most melodies in music move in what is known as "stepwise motion" a lot of the time, which means that each note is half or a whole step away from the one before it.
So these entire and partial phases offer you an idea of how melodies are constructed.
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