I went to Anime Central this year, and I saw the Pillows play there. So they are willing to come to America, and are willing to go to conventions to play. But how much you'd have to pay them...I have no idea. The audience for each of their concerts was larger than the total atendees at Kumoricon. I'm sure a band like the Pillows would draw a larger crowd to Kumoricon. A Jpop cover band would be cool...a band Friday, and a dance Saturday..sounds like a good idea to me!