i have quite often, but its never really background music. usually its just a guitar riff, but im able to play guitar, bass and drums(all drums/cymbals, not just a kick and snare) at the same time if im concentrating. sometimes its not some particular song thats playing in my head, but i can compose my own stuff while its playing, but when i start to make up my own complex guitar solos, drums and bass go more basic and less detailed and complex, because im more concentrated of composing the guitar solos in real time
"Where wisdom reigns, there is no conflict between thinking and feeling."
— C.G. Jung