Radio gymnastics 1, 2, 3, 4; each number is one beat

Or the quarter note as shown in the picture is one beat

bpm: beats per minute

Note duration, also known as note value or tone value, is used in musical notation to express the relative duration between notes. One perfect note is equal to two half notes; four quarter notes, eight eighth notes; sixteen sixteenth notes, and thirty-two thirty-second notes.

This is just the ratio of note durations

As shown in the picture, the white keys CDEFGAB are arranged repeatedly

The key is a pattern, the mode of the major key: whole, half, whole, whole and half

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The distance between two sounds

Increase by four

Decrease by five

The bass is turned

A major triad plus a major seventh tone

A minor triad plus a minor seventh tone

The circle of fifths can be thought of as the tonic of the key, or the root of a chord

The name of each note in the key

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