What is the difference between 42, 43, 44, and 86 beats in music?

The writing should be two-four (2/4) beat, three-four (3/4) beat, four-four (4/4) beat, six-eight (6/8) beat.

I. Notes:

Two-four beat: quarter note for one beat

Three-four beat: quarter note for one beat

Four-four beat: quarter note for one beat

Six-eight beat: eighth note for one beat

Second, the number of beats:

Two-Four beat: two beats for one measure

Three-four beat: three beats for one measure

Three-four beat: three beats for one measure <

Four-four beat: four beats in a measure

Six-eight beat: six beats in a measure

Three, rhythmic performance:

Two-four beat: strong, weak

Three-four beat: strong, weak, weak

Four-four beat: strong, weak, sub-strong, weak

Six-eight beat: strong, weak, weak, sub-strong, weak, weak

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Expanded:

Beat structure -

"A beat can be defined as a regular pattern of strong and weak beats alternating patterns. At the beginning of a work, beat numbers are used to identify this recurring pattern of duration ...... Although the beat is generally well specified by the beat number, the beat is by no means merely a notational element." (Benward and Saker 2003, 9) Defining the beat requires a pattern of regular occurrences of strong pulses first - a pulse cluster.

Pulse clusters are commonly defined by treating a beat repetition as the first pulse, and then counting it, along with all the pulses that precede the appearance of the next beat, as a pulse cluster (MacPherson 1930, 5;?Scholes 1977). Beats can generally be split into duplets and triplets (MacPherson 1930, 5;?Scholes 1977).?

The structural organization of music presented by beats is the lowest level of foundation of a composition (MacPherson 1930, 3). Rhythms are categorized in terms of various attributes of time, and can be divided generally into metronomic rhythms, durational rhythms, and free rhythms (Cooper 1973, 30)

Baidu Encyclopedia-Musical Metronomy