Regarding your other comments, my understanding is that resist status effect traits (including the songs that enhance them), have two possible outcomes: 1) You completely resist the effect and as such you never even get the icon, 2) You partially resist the effect, which means you are still infilicted with it, but with a shorter duration than normal. So even though you only got a "30-40% resist rate" on those things during Rostrum Pumps, I'm willing to bet that the other 60-70% of the time the effects always lasted considerably less time than they would have had none of those songs/spells been used to enhance the trait.
Yeah, this is fairly common knowledge (whether accurate or not, I don't know for sure, but like everyone else, I assume it), but, in my opinion, the shorter duration is inconsequential(sp) due to the fact that if your PLD has been petrified you want to Stona him right away, and not wait to see if it will be a partial resist that would have a shorter duration than normal.