Primarily, I need ideas about how to make it more interesting than my current idea- Primarily, increase numeric effects of a bardic performance by 1, and increase the DC for any effect by 1. The thing is, I'm not entirely certain what to make it actually DO. I want to be something worth investing in, primarily because people working as a band rather than alone is a primary reference.
For relevance- I plan on running a personal variant of Gestalt, where everyone gestalts with bard, however, I want to provide a fair amount of options with cooperation than as listed above. Interesting effects would be really enjoyable to have.
I'm really unclear on what your idea is.