What does "ain't" mean and how is it used in English?

英語での「AIN'T」という言葉の使い方（スラングレッスン）

Ella Fitzgerald and Duke Ellington "It Don't Mean A Thing (If It Ain't Got That Swing)"

The Meaning of "He Ain't Heavy, He's My Brother

It Don't Mean A Thing (If It Ain't Got That Swing) (Studio Video)

Ain't Meaning

Ella Fitzgerald - It Don't Mean a thing (If it ain't got that swing) [1974]

How to use the Contraction 'Ain't' - British English

"It Don't Mean A Thing (If It Ain't Got That Swing)" Jazz Standard Cover by Robyn Adele Anderson

It don't mean a thing, if it ain't got that Ring! - Rings of Power Season 2.5

AIN'T IN ENGLISH SPEAKING

It don't mean a thing (if it ain't got that swing)

Life Ain't Fair and the World Is Mean

Ella Fitzgerald- "It Don't Mean A Thing If It Ain't Got That Swing" 1957 (RITY Archives)

Duke Ellington - It don't mean a thing (1943)

Uso y significado de aint’t y tryna – Contracciones Informales | Clases inglés

Ain't No Meaning (feat. Charlie Chaplin)

It Don't Mean a Thing (If It Ain't Got That Swing) (1990 Remaster)

Tony Bennett - It Don't Mean a Thing If It Ain't Got That Swing (from MTV Unplugged)

Ella Fitzgerald & Duke Ellington - It Don't Mean A Thing If It Ain't Got That Swing