It would make a good world where his song powers mostly don't amount to much; most of the action happens either on the human scale or the mecha scale, and his primary metagift falls right in between. This would force him to work mostly on the human scale, which is always good for keeping him interesting and away from SI excesses.
-- Bob
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Then the horns kicked in...
...and my shoes began to squeak.
-- Bob
---------
Then the horns kicked in...
...and my shoes began to squeak.