Sadly, no.
Chat with our AI personalities
yes
It is possible, but I have only seen it on playstation
You don't, unless you hack your GH3 disc on a PC, and add them there.
As you have Guitar Hero 3 on the PS2, you aren't able to get custom songs, however, if you have guitar hero 2, you are able to put the disk (assuming it's a proper copy) and in your computer. Youtube can help with this, but you can use "scorehero". Look that up on google. :)
No