Which instruments were in the bluegrass big five?

The "Bluegrass Big Five" refers to the five core instruments that are typically found in a bluegrass band. They are:

1. Banjo: The defining instrument of bluegrass, providing the driving rhythm and often featuring complex picking patterns.

2. Guitar: Typically plays the rhythm section alongside the banjo, but can also provide lead lines and harmonies.

3. Mandolin: Provides melodic lines and fills, adding another layer of complexity to the sound.

4. Bass: Provides the low end and rhythmic foundation, typically played with a flatpick.

5. Fiddle: Brings the melodic and improvisational element to bluegrass music, adding a traditional folk element.

While other instruments are sometimes used in bluegrass, these five are considered the essential core of the genre.