Final answer:
The Song of Roland was performed by troubadours, who were medieval entertainers skilled in music and poetry.
Step-by-step explanation:
The Song of Roland was sung by professional entertainers called troubadours. These performers were common in medieval European culture and were known for their skills in poetry and music, often conveying stories of chivalry and courtly love. They played an important role in preserving and spreading orally transmitted tales and history, such as the epic Song of Roland, which celebrates the valor of Charlemagne's knights.