AFAIK, Nero didn’t fiddle while Rome burned.
He didn’t own a fiddle (violin). It would have been a lyre, as violins were not even invented until the 1500’s.
The ‘other’ rumor was that Nero put on a costume and sang on stage while Rome burned. He didn’t sing, he didn’t play a fiddle, and he didn’t play a lyre.
Below is a better account of what happened. (much of what ‘we’ are taught as ‘history’ is a BIG LIE)
“According to Tacitus, upon hearing news of the fire, Nero rushed back to Rome to organize a relief effort, which he paid for from his own funds. After the fire, Nero opened his palaces to provide shelter for the homeless, and arranged for food supplies to be delivered in order to prevent starvation among the survivors. In the wake of the fire, he made a new urban development plan. Houses after the fire were spaced out, built in brick, and faced by porticos on wide roads.
Nero also built a new palace complex known as the Domus Aurea in an area cleared by the fire.”
The last line explains WHY the fire was ‘allegedly’ started. Nero wanted to clear an area so he could build this new castle, and it got out of control.
It was only about 10% of ‘Rome’ that actually got damaged in the fire.