i don't care about lyrics for the most part, unless they are funny or really abysmally bad.  two of my favorite bands of all time have lots of stupid lyrics - the beatles sing about silly shit and at least half of the led zeppelin catalog is about the hobbit.  i like listening to songs in languages i don't know because my brain doesn't take the extra step of word comprehension and i can just enjoy the voice as an instrument.  i don't appreciate that much rap partially due to my blase 'tude about lyrics.