How many people are there in a blues band?

The easy answer is as many as you like ! It is generally the same with how many people are there in a rock band ? Logically, as a 'band', it would be no fewer than a trio (for example Cream), although a twosome like The White Stripes may well suffice. Blood Sweat & Tears oscillated around nine musicians, and some bands had even more.

Archetypal blues instrumentation includes drums, bass, guitar, keyboards, harmonica (harp) and often vocals on top, therefore four and five is an average number.