
Paulcynic |

The Bard has a Masterpiece called The Quickening Pulse. Masterpieces are Supernatural effects. QP says that it quickens the target's heartbeat to dangerous levels. This suggests that its not possible due to the fact that Incorporeal creatures have no body. I'm pretty sure its not possible based on this, but if there's an argument for it working, that'd be helpful :)
Incorporeal (Ex) An incorporeal creature has no physical body. It can be harmed only by other incorporeal creatures, magic weapons or creatures that strike as magic weapons, and spells, spell-like abilities, or supernatural abilities. It is immune to all nonmagical attack forms. Even when hit by spells or magic weapons, it takes only half damage from a corporeal source. Although it is not a magical attack, holy water affects incorporeal undead. Corporeal spells and effects that do not cause damage only have a 50% chance of affecting an incorporeal creature (except for channel energy).
The Quickening Pulse (Percussion, Wind)
Effect: You create a musical tempo that first mirrors your enemies' heartbeats, and then quickens them to dangerous levels. When you complete the performance, all enemies within 30 feet who can hear your performance must save or take 1d6 points of damage as their pounding heart causes them to sweat blood. Creatures that are immune to critical hits are unaffected by this ability.
Each round that you continue the performance adds another round to the bleed effect. Abilities that extend the duration of a bardic performance (such as Lingering Performance) affect this masterpiece.

mplindustries |

"An incorporeal creature has no physical body. An incorporeal creature is immune to critical hits and precision-based damage (such as sneak attack damage) unless the attacks are made using a weapon with the ghost touch special weapon quality. In addition, creatures with the incorporeal subtype gain the incorporeal special quality." (Bolded for emphasis)
The Quickening Pulse does not work on creatures immune to critical hits, and it is not a ghost touch weapon, so it does not work on Incorporeal creatures.
Also note that the Quickening Pulse is a pretty terrible Masterpiece--1d6 damage is laughable for the opportunity cost.
I've seen that you are interested in Masterpieces--have you ever seen the mini-guide I wrote on them once?