BTW
What is a "phat" chord?
Is that something like a "power" chord?
Will it work for bluegrass?

Phat: an adjective in African American slang used to express approval. Hence, someone or something that is phat could be cool, rich, entertaining, intelligent, attractive or otherwise to be admired. When the word first surfaced in the 1960s, men generally used it to describe attractive, or "fine", women.
The term Phat has a number of uses: *Phat is an adjective to describe approval in Hip Hop culture. Hence, someone or something that is phat could be cool, rich, entertaining, intelligent, fly or otherwise to be admired. The term derives from Black English Vernacular (Ebonics) as a deliberate misspelling of the word fat.
Phat: (comparative phatter, superlative phattest)
1. (slang) excellent
2. (slang) sexy
3. (slang) (music) rich in texture, prominent.
i.e., The song has a phat bass line.