Sadly, no.
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
lime wire or go onto Google and type in the name of a demo name and put mediafire after it. that's how i got them all
Selena Gomez,jonas brothers,metro station and more
yes
You can't, only with Xbox 360.
it would be impossible to know because GH4 isn't out yet! maybe, if you can put songs on gh3 (custom). It might work for gh4
Sadly, No you cant put good songs on there but u can kick animated players butts!
It is possible, but I have only seen it on playstation
no you can not ONLY in guitar hero WORLD TOUR.
There are some that are not on the albums that were released by evanescence from the origin EP album which that album was just a demo but some of the songs from their were taken and put on the Fallen album.
yes its possible, just copy the songs then boom!
nope, only if modded. that would be the only way
As far as I know, you can't without some sort of hacking.