Iron Maiden is a good example of a band who's lyrics have obvious meaning. While Bob Dylan is a good example of hidden meaning.
And Beck is a good example of words people say when they are wacked out on drugs.
from Loser:
"In the time of chimpanzees I was a monkey
butane in my veins and I'm out to cut the junkie
with the plastic eyeballs, spray-paint the vegetables
dog food stalls with the beefcake pantyhose
kill the headlights and put it in neutral
stock car flamin' with a loser and the cruise control
baby's in Reno with the vitamin D
got a couple of couches, sleep on the love-seat
someone came in sayin' I'm insane to complain
about a shotgun wedding and a stain on my shirt
don't believe everything that you breathe
you get a parking violation and a maggot on your sleeve
so shave your face with some mace in the dark
savin' all your food stamps and burnin' down the trailer park"
makes no sense at all but is still a great song