Let's get it on. The Blues was developed simultaneously in many different regions of America. From the Mississippi Delta came the Delta Blues singers. Usually, it was one person singing and playing the guitar. This style features a lot of moaning in a heavy vocal style.
Some guitar players use a slide to emulate the sound of a person cryin'.
A slide is a tube ofmetal or glass that fits over the finger of the fretting hand. The player uses it to slide notes up and down. From the Delta we also get the standard form of the Blues. I could bore you with a short musical theory lesson, but I won't. All you need to know is that you don't need nuthin' but three chords, a guitar, and a voice to play some low down dirty Blues.