Yes, that was when Stapp said he had an injection of meds into his throat so he could sing. They were going to cancell the entire concert but then decided to add in the Wallflowers and they would split stage time (instead of playing a full show, they each played a "half" show).
The things that I've loved the things that I've lost
The things I've held sacred that I've dropped
I won't lie no more you can bet
I don't want to learn what I'll need to forget
- Audioslave, "Doesn't Remind Me"