Doug's Musical Ability, in GURPS

[Mark Skarr]

Shepherd wrote:

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Look more closely at the write-up. Ultra Power merely provides rules for pulling power stunts with your other powers, it grants no powers by itself. For example, if you've got super speed, you can use Ultra Power to try to disarm fifty bombs in one second even if a strict reading of the power indicates that such a task would be impossible.

Not quite.  You must have a power talent, but not any abilities.

Supers[/i], pg 112]To do this, a hero must have a power talent, and must have taken the advantage Ultrapower (see p. 30). Then the player describes the feat he wants to accomplish

He doesn't have to have any powers, just "Musical Power Talent."  And, if you check the Latent Powers section on the next page, it is a bit more clear:

Supers[/i], pg 113]Since the system for one-use powers relies solely on Will and Talent, and not on any abilities of a power, it’s also suitable for characters with latent powers (Talent but no abilities) who are only
capable of the occasional amazing feat of power because their full potency has not yet developed!

I mean, that sounds almost exactly like what Doug does.
ETA: For some reason the quoting system isn't working correctly for me . . ..