Seventh chords are the most common type of extended chord used in contemporary harmony because they provide a rich and complex sound that can be used to create a variety of moods and atmospheres.

Modal interchange is the use of chords from one scale in the context of another scale. This can be used to create a variety of interesting and unexpected sounds.

Chromaticism is the use of chromatic notes to create tension and release. This can be done by using chromatic passing tones, chromatic neighbor tones, or chromatic mediants.

Chromatic passing tones are the most common type of chromaticism used in contemporary harmony because they are a simple and effective way to create tension and release.

Sharp alterations are the most common type of chromatic alteration used in contemporary harmony because they are a simple and effective way to raise the pitch of a note.

Tritones are the most common type of dissonance used in contemporary harmony because they are a very strong and unstable sounding interval.

Stepwise motion is the most common way to resolve dissonance in contemporary harmony because it is the smoothest and most natural sounding way to move from one note to another.

The perfect authentic cadence is the most common type of cadence used in contemporary harmony because it is a very strong and conclusive sounding cadence.

Diatonic modulation is the most common type of modulation used in contemporary harmony because it is the simplest and most straightforward way to move from one key to another.

Verse-chorus form is the most common type of form used in contemporary harmony because it is a very simple and effective way to create a song that is both catchy and memorable.

Homophony is the most common type of texture used in contemporary harmony because it is the simplest and most straightforward way to create a song that is both clear and easy to understand.

The piano is the most common type of instrumentation used in contemporary harmony because it is a very versatile instrument that can be used to create a wide variety of sounds.

Belting is the most common type of vocal style used in contemporary harmony because it is a very powerful and expressive style that can be used to create a wide variety of sounds.

Pop performance practice is the most common type of performance practice used in contemporary harmony because it is a very simple and straightforward style that is easy to understand and enjoy.

Pop audiences are the most common type of audience for contemporary harmony because pop music is the most popular type of music in the world.