Στη μουσική featuring λένε. Συμφωνεί και η Βίκι: In pop music guest appearances are often described with the words featuring, with, or and. It is abbreviated in credit lists as Feat., Ft., f.
In television series, a guest star is an actor who appears in one or a few episodes. In radio and television shows, a guest star is a guest of the show who is a celebrity.
Για τα τηλεοπτικά, καλά τα λέει ο ντοκ. http://en.wikipedia.org/wiki/Guest_appearance