Folk Music seems to embrace many different styles, including Blues, Country, traditional jazz, ethnic. Some of the performers more closely resemble a rock band than anything else. Others seem closer to a skiffle group. There are thousands of acoustic guitars, hundreds of basses both acoustic and electric, mandolins, banjos, ukuleles, many more exotic stringed instruments, accordions, harmonicas, many violins, percussion instruments of all kinds including many full drum kits, some electronic pianos, and some synthesizers and samplers.
Harmony is everywhere.
There is echo, fuzz, reverb. The quality of the sound is first-rate. The lighting is merely functional not used at all in daylight hours. A surprising number of performers are seated. Most of the topics of the songs are drawn from personal experience.