Oh, I can't give you a straight answer to that, but I feel that I really, really, really have to mention the opening keynote song from the Broadway musical, Fiddler on the Roof. It's based on stories by the Yiddish author, Sholom Aleichem, and set in a Jewish settlement in imperial Russia in the early 1900s. It was a huge hit on Broadway in 1964 and continues being revived and performed. The opening number is entitled "Tradition," and the story centers around the conflicts between tradition and modernity. It opens with the line, "Without tradition, we would be... like a fiddler on the roof!"

https://www.youtube.com/watch?v=sWSoYCetG6A

Tradition, tradition! Tradition!

Who, day and night, must scramble for a living,

Feed a wife and children, say his daily prayers?

And who has the right, as master of the house,

To have the final word at home?

The Papa, the Papa! Tradition!

Who must know the way to make a proper home,

A quiet home, a kosher home?

Who must raise the family and run the home,

So Papa's free to read the holy book?

The Mama, the Mama! Tradition!

At three, I started Hebrew school. At ten, I learned a trade.

I hear they've picked a bride for me. I hope she's pretty.

The son, the son! Tradition!

And who does Mama teach to mend and tend and fix,

Preparing me to marry whoever Papa picks?

The daughter, the daughter! Tradition!

Well India have lots of traditions and they are really amazing but few of them are like kanyadan during wedding .

Second is Atithi devo bhavah It means “the guest is equivalent to god”.

And most famous and well known tradition is welcoming others with a word NAMASTE .it  is one of the most popular Indian customs