I would be interested in this type of information as well, but never found any. There is a crap load of info on how to play the piano, but not on how to play an arranger. If you find something, let us know. On commercial recording, I hear fills at the end of a singing phrase, but only drums and bass, when the singer is singing, sometimes a strumming guitar. The dominant instrument stays out of the singers way, when he/she is singing. This is not the case in a live situation.
Starkeeper