The tradition of busking dates back to Antiquity. This age-old practice has acquired a romantic association and draws people of all backgrounds together into a small crowd to witness a musician singing their heart out for a few pence to a few pounds.     In addition to earning a living with their performances, several now-famous musicians received their starts playing on the streets, such as KT Tunstall, Lorena McKinnit, and Ed Sheeran. While wandering the streets of my favorite cities, my ears stay alert to the strums of a guitar down the alleys and sidewalks. Though I will never be brave enough, a bucket…