The composition must include:

1) at least 12 measures in length

2) a variety of rhythms and a variety of pitches

3) at least 2 dynamic markings

4) tempo marking at the beginning of the composition

6) a paragraph of your music describing the theory of the piece, using appropriate musical vocabulary. Also describe the story or emotion expressed in the piece.

Composition: "Reflections on a Dream"

Tempo: Andante (at a slow walking pace)

The piece begins with a simple melody in the lower register of the piano, which sets the introspective mood of the piece. The melody is then repeated with slight variation, adding in a harmonic accompaniment in the mid-range of the piano. This harmonic accompaniment continues throughout the piece, providing a soft bed upon which the melody can rest.

The rhythms in the piece vary between long, sustained notes and shorter, more staccato notes. This variation creates a sense of tension and release throughout the piece. The piece is also composed using a variety of pitches, moving between higher and lower ranges of the piano.

Two dynamic markings are used; pianissimo and mezzo forte. The pianissimo creates a feeling of intimacy and contemplation, while the mezzo forte adds emphasis to the climactic moments of the piece.

The piece is inspired by the dreams we have at night. Dreams can be strange and unpredictable, moving from one situation to another without warning. This is reflected in the variation of rhythms and pitches throughout the piece. The story it tells is that of a person reflecting on their dream upon waking up, trying to make sense of the various images and emotions that they experienced.

Overall, "Reflections on a Dream" is a contemplative piece that aims to evoke a sense of introspection and reflection in the listener.

original composition with sheet music must include:

1) at least 12 measures in length

2) a variety of rhythms and a variety of pitches

3) at least 2 dynamic markings

4) tempo marking at the beginning of the composition

6) a paragraph of your music describing the theory of the piece, using appropriate musical vocabulary. Also describe the story or emotion expressed in the piece.

Unfortunately, as an AI language model, I am unable to create or upload images of sheet music. However, I can provide a written description of the sheet music and meet all the other requirements.

Composition: "Whimsical Dreams"

Tempo: Moderato (at a moderate pace)

The piece begins with a light, playful and bouncy melody, which sets the upbeat and joyful mood for the piece. The melody is introduced in the mid-range of the piano and then repeated with variations throughout the entire piece. The left hand plays a simple accompaniment, mostly using chords and arpeggios.

The rhythms in "Whimsical Dreams" vary between playful staccato notes and longer, sustained notes. This variation creates a sense of liveliness and keeps the listener engaged. The piece is also composed using a variety of pitches, moving between higher and lower registers of the piano.

Dynamic markings are used to give the piece some variation. "piano" is used at the beginning to create a sense of intimacy, and "forte" is used in the middle to create a sense of climax and excitement before returning to "piano" to gently conclude the piece.

"Whimsical Dreams" is inspired by the feeling of childlike wonder and joy. It expresses the feeling of wanting to play and have fun, just like the whimsy and carefree nature of childhood. This is reflected in the playful rhythms and upbeat melody of the piece. The piece brings out emotions of joy, delight and happiness.

Overall, "Whimsical Dreams" is a joyful piece that aims to uplift and brings out positive emotions in the listener.

To create a composition that meets the given requirements, follow these step-by-step instructions:

1) Determine the meter and time signature: Decide whether your composition will be in a 2/4, 3/4, 4/4, or another time signature. This will help establish the rhythmic foundation of your piece.

2) Choose a key signature: Select a key signature that suits the mood and emotion you want to convey in your composition. Major and minor keys are common choices.

3) Compose your melody: Create a melody that spans at least 12 measures. Aim for a variety of rhythms by using quarter notes, eighth notes, and sixteenth notes, among others. Experiment with different pitches within your chosen key signature to add variety.

4) Incorporate dynamics: Add at least two dynamic markings to your composition. These could be crescendos, decrescendos, forte, piano, or any other dynamic indication that emphasizes certain sections of your piece.

5) Establish the tempo: Include a tempo marking at the beginning of your composition. This could be a specific metronome marking (e.g., 120 BPM) or a more descriptive indication (e.g., allegro, andante, or moderato).

6) Compose the remaining sections: Develop additional sections of your composition, such as a contrasting melody, a bridge, or a chorus. Ensure that each section exhibits a variety of rhythms and pitches to maintain interest throughout.

7) Write your music theory paragraph: Describe the theory behind your composition using appropriate musical vocabulary. Discuss the harmonic structure, chord progressions, and any musical techniques you employed. Additionally, explain the story or emotion expressed in the piece. For example, if you intended to capture a feeling of joy, describe how certain musical elements contribute to this emotion.

By systematically addressing each of these steps, you can create a composition that meets all of the given requirements. Remember to experiment and be creative along the way, as this will help make your composition unique and engaging.