Yes, every intro of the nearly 900 episodes of Mister Rogers’ Neighborhood was played live, but that’s not the reason—it’s because of improvisational jazz pianist Johnny Costa.

(I fell down @treehousedetective’s YouTube rabbit hole; his channel is filled with these surprising-yet-apparently-true nuggets. I highlighted this one because of its wholesomeness. Slightly less wholesome: why classic cartoon characters wear white gloves, why Mr. Snuffleupagus was finally revealed to adults, and why Doc and Marty were friends. I’ll never unknow these things.)