People who play a stringed instrument by brushing or playing the strings with a finger or a plectrum.
Strummers are often associated with playing guitars or other stringed instruments in a casual or folk music setting.
Examples:
The strummers played their guitars at the campfire.
I want to be one of the strummers in the band.
The strummers strummed their ukuleles by the beach.
The strummers made the whole room sing along.
The strummers' music made everyone dance and clap.
The strummers' fingers danced on the strings, making beautiful music.