Crueler than I thought. I searched my collection for some time. (Do you have any idea how many H's and J's there are?) Then I went online, not to cheat, just to see if I could find anyone I was forgetting. Came up with Andrew Imbrie. If he's not been mentioned, yet, the next letter is E. If he has, then I have to settle for Akemi Ishijima, whom I don't know, but who has a piece on one of the cds I own. Pfffft.
Now if we could use group names, like IDLH or Incapacitants....