Original: The Chicago blues is a form of blues music that developed in Chicago , Illinois , by taking the basic acoustic guitar and harmonica-based Delta blues , making the harmonica louder with a microphone and an instrument amplifier , and adding electrically amplified guitar , amplified bass guitar , drums , piano and sometimes saxophone and trumpet .
Simplified: The Chicago blues is a form of blues music that developed in Chicago , Illinois by adding electrically amplified guitar , drums , piano , bass guitar and sometimes saxophone to Delta blues .