^ OMG! That is SO organized and looking GREAT!
I confirmed these 2 are NOT our Katy:
1) "Unknown Track(s)" from "Chasing Someday" by Drew Holcomb & the Neighbors [note: credited as Katy Hudson]
2) "Unknown Tracks(s)" from Shout Praises!: "Kids Shout to the Lord" by Shout Praises! Kids [note: credited as Katelyn Perry, just like on the Alfie soundtrack]
And the Jaydyn Maria one, Man's World.. she's more than backing vocals... she actually is a main vocalist too.
And thru research on The Matrix.. some ppl that recorded Matrix songs after Katy.. still have Katy's backing sounds on them...http://katyhudson.ca/timeline/2004.shtml
(might just be the very last one.. the skye sweetnam chick)