For example in this episode’s poem:

天（そら）に響めく（どよめく） まやかしの

捉う心（とらうこころ）にはしる旋律（せんりつ）

For me it’s interesting that the kanji used for そら (sky/heaven) is not the usual 空 but 天 which is never read そら, usually read てん, but it conveys the meaning of heaven more than 空.

I’ve seen Bleach doing it several times in the poems