I see it's web address and it is The Mask But Nothing else :P
Either Way, Here is Katy's Best Song on the Prismatic Album, which sadly they didn't do during Half Time.
https://www.youtube.com/watch?v=zBwXi6V6arM
Or Hummingbird Heartbeat :(
https://www.youtube.com/watch?v=53D2VH3pRTQ
And Before anyone says anything, remember I am one of the youngest members of this board ;) (Katy Perry is four years OLDER than me)