Christina Aguilera has cancelled her entire summer tour due to strained vocal cords, and Sean Hackbarth has a few ideas about who could take her place - and who couldn't.

A successful summer concert tour by a top star or group could pull in upward of $100 million or more - not counting CD sales - so the former Mouseketeer's decision to sit the summer out could have economic implications.

If nothing else, her fans are in a panic. Here are some remarks from the Christina Aguilera web site message board:

christina called in today on trl, and the whole summer tour is cancelled because of her voice. god, i dont know what to do

And:

OMG!!!! R U shure it was her???? oh my gawsh!!!!!!!! what happened to her voice?? I'm sooo sorry for all of u that bought tickets... I was planning to, but my dad would't let me, cuz I live too far away......

And:

i know me to! im so upset and i've been crying for about an hour

*feel better soon christina*

Yes, it will be a long summer indeed.