Found under a pew in the center of the balcony, no envelope:

It is another page from Dr. Seuss' "Oh Say Can You Say." It is the last poem/tongue twister from the book.
Text:
The binary at the top of the page translates to hex:"The storm starts
when the drops start dropping.
When the drops stop dropping
then the storm starts stopping."
which translates to:65 6d 70 74 79 20 42 6f 78 20 53 65 61 74 73
(Thanks Jester, skunkwaffle, surrealisticpill, ignatzmouse)empty Box Seats
The numbers across the rest of the page are once again guitar tabs:

which translate to:
Thanks to Deagol for the nifty guitar tab decoder.NO AUDIENCE NO CURTAIN CALL