Boss Battle 1 was actually co-written by Matsueda and Uematsu together, according to my memory of Wikipedia. Although maybe they're wrong or my memory is wrong and Uematsu only did the arrangement.

Quote Originally Posted by Sephex
And I KNEW Uematsu did the Tyrano Lair! This became apparent to me when Kuja's theme sounded like it at a different pace.
yeah, Uematsu commonly borrows from himself.