While different sides of our brain are indeed used for special functions.For example, language uses the left hemispherre.while the right hemisphere helps us read a emotion.
The guitar player is far to the left, she is cropped almost photographically, and the room to the right is in shadows, giving a sense of movement as if she has just turned to her right.
For example, you need to be more to the left on this continuum to read a book than watch a TV show, and you'd have to be even farther to the left to start practicing the piano.
Driving either from the ground or from horseback, right-handed men preferred to walk or ride on the left side of the horses so they could control the animals with their right hand.
And it's possible that this left side convention was in place so right-handed soldiers and knights could draw their weapons more quickly against passing enemies.
There aren't clear and obvious reasons to choose one side over the other, so the origin of driving conventions is a perfect opportunity for the mathematics of game theory and symmetry breaking.