“There is nothing unusual about having instrumental music playing in your head if you listen to classical a lot.”
This is the solution to low-brow earworms, fer sher. ;^)
Actually, I consider this feature a dividend of listening to the classical composers; one can call up movements and solos, and vary the orchestrations - it’s never boring.
Otoh, Bobby Goldsboro singing something in your head can be a near-death experience! But, merely summon the shades of Vivaldi, Bach, and Beethoven, and the screeching hyenas vanish.
It works for me.
In popular music, I am more likely to hear Paul Simon, Graham Parker, or the Byrds.