The lyrics on the Melvins album "Houdini" are almost entirely gibberish, it's mostly English but the words are half random and half nonsense. If you squint your ears a bit, you can imagine what it's like to have brain damage. Classic! Looks like the whole album is on yourube, check out some examples...

http://www.youtube.com/watch?v=KwSOrd4E7yw (Night Goat) http://www.youtube.com/watch?v=OPkHP3a9WKU (Lizzy)