For some reason I've been obsessing over this
I found a description of the "Hazienda" bump that was posted a month after it aired and it sounds like it is the same:"Where can I find the song called "Hazienda."?
I remember hearing it in an AS bump that had sheet music being written as "Hazienda" was being played.
The bump said that someone liked this song so much that they put the sheet music in the bump."
I have the recording of Sunday March 22, 2005 and Thursday March 26th, 2005 (Viewer Card Night) but neither of them have the bump
They must've slipped it in Monday or Tuesday.