Street performing, one of the oldest jobs in humanity. 

As long as there have been streets, there have been street performers. In ancient Egypt, Greece and Rome

people entertained and passed the hat for donations. During the Middle Ages in Europe, troubadours were the personal street performers of the aristocrats, while minstrels and jongleurs brought joy to the general public. 

The simplicity of the activity - exchange your musical offer for what will be your bread and your shelter - makes it one of the most full-filling enterprises ever. Not to mention the goods of music in people's minds, hearts and souls.