If I am writing about the tango and describing its steps would capitalize word tango?

You would capitalize "Tango" when referring to the dance itself, but not when simply describing the steps.

Here are some examples:

Capitalized:

* "The Tango is a passionate and sensual dance."

* "I've always wanted to learn the Tango."

Not Capitalized:

* "The tango steps are complex and require precise footwork."

* "The tango is a dance of close embrace."

It's similar to how you'd capitalize "Waltz" when referring to the dance, but not "waltz steps."