Definitions of Dance, Music, and Singing as Expressions of Joy. Humans have strong biological predispositions for these activities, linked to emotion, communication, and social bonding, with genetics influencing ability and enjoyment, while environment and culture shape expression; it's a universal human trait.

Humans have strong biological predispositions for these activities, linked to emotion, communication, and social bonding, with genetics influencing ability and enjoyment (around 40-80% for music skills), while environment and culture shape expression; it's a universal human trait.

That dance (and by extension, music) is merely a sequence of movements or notes without qualifying as a "language," these forms are indeed powerful modes of communication and expression across cultures and species. They often transcend verbal language, conveying emotions like joy in ways that are instinctive and universal. Below, I'll provide accurate, standard definitions based on established sources (e.g., from dictionaries, anthropology, and ethology), emphasizing how they serve as vehicles for expressing joy in every living being—from humans to animals. Note that "every living being" extends to non-human animals, where these behaviours manifest in instinctual, non-artistic forms, often linked to positive states like playfulness, contentment, or social bonding, which can be interpreted as joy. 

Dance

Definition: Dance is the rhythmic movement of the body, typically in time to music or a beat, performed to express ideas, emotions, or stories. It involves purposeful or improvised sequences of steps, gestures, and postures, often with aesthetic, cultural, or symbolic significance (e.g., from Merriam-Webster: "to move one's body rhythmically usually to music"; Oxford: "a series of movements that match the speed and rhythm of a piece of music").

As an Expression of Joy in Every Living Being: Dance is a primal way to manifest joy through physical exuberance. In humans, it's seen in celebratory dances like those at weddings or festivals, where movements release endorphins and foster communal happiness. Among animals, dance-like behaviors express similar elation: puppies "dance" by bounding and spinning when excited; birds such as manakins perform elaborate courtship "dances" that signal vitality and joy; even insects like bees use the "waggle dance" to share excitement about food sources. Ethologists note that these movements often occur in safe, resource-rich environments, indicating a state of joy or well-being, as they promote social bonds and reduce stress.

Music

Definition: Music is the art of arranging sounds in time through elements like melody, harmony, rhythm, and timbre to produce compositions that evoke emotional or aesthetic responses. It can be vocal, instrumental, or a combination (e.g., Britannica: "art concerned with combining vocal or instrumental sounds for beauty of form or emotional expression"; Cambridge: "a pattern of sounds made by musical instruments, voices, or computers, or a combination of these, intended to give pleasure to people listening to it"). 

As an Expression of Joy in Every Living Being: Music universally channels joy by stimulating pleasure centres in the brain, often through upbeat rhythms and harmonies. Humans create joyful music in genres like pop or folk to celebrate life events. In the animal kingdom, music-like vocalizations express contentment: birds sing complex songs in the morning to affirm territory and well-being, with studies showing increased singing during positive social interactions; whales produce "songs" that may convey excitement in pods; even primates like gibbons "duet" in rhythmic calls during playful or affectionate moments. Biologists link these to evolutionary adaptations where sound production signals health and happiness, fostering group cohesion.

Singing

Definition: Singing is the production of musical tones using the voice, often with words or without (vocally improvising melodies). It differs from speaking in its sustained pitch, rhythm, and emotional inflection (e.g., Dictionary.com: "to utter words or sounds in succession with musical modulations of the voice"; Collins: "the activity of making musical sounds with the voice, usually a tune with words").

As an Expression of Joy in Every Living Being:

Singing is a vocal extension of music, directly tied to emotional release, particularly joy. Humans sing in moments of happiness, like lullabies for comfort or anthems for triumph, as it boosts oxytocin and dopamine. Across species, vocalizations akin to singing express joy: songbirds trill merrily when fed or in safe nests; wolves howl in packs during successful hunts, interpreted as communal joy; frogs "sing" choruses in breeding seasons to signal vitality. Zoologists observe that these sounds increase in frequency and complexity during positive states, serving as a non-verbal broadcast of well-being to others.

These definitions highlight that dance, music, and singing are not just mechanical sequences but evolved mechanisms for emotional expression, including joy, shared by humans and animals alike. In the context of the X post videos above (Cute, AI-generated videos of a babies "dancing" with swagger), it exemplifies how even stylized movements can evoke joy—mirroring how living beings instinctively move or vocalize to celebrate life's lighter moments.