The COSMOS has no emotion, and so cannot benefit, or be afflicted by, INSPIRATION (ie: timers, physics, objects, and the like)
Okay, the inanimate COSMOS I can understand, but what about the GODS who control the COSMOS!? Huh?
"Oh, gods of ICRPG, grant us this boon as I play you this tune!"
Maybe, just maybe, the INSPIRATION can work as a soothing sound to the GODS to temporarily bring about changes in the physical COSMOS (i.e. slowing/stopping time, altering the composition of matter)? Maybe this is a Milestone and always a HARD roll with 2 EFFORT?
Otherwise, like this Bard Class! I have one player who I think would really enjoy this class a lot.