This is incorrect, regardless of the nonsense put forth by BMI and ASCAP (and the Harry Fox Agency, which is not an agency but a wholly owned rights-protection racket!). Admittedly, quotation of song lyrics is very limited; but the fact that they're song lyrics does not mean that there's no fair use. I have yet to find a reported opinion holding that two lines (or less) of lyrics that do not contain a proper name fall outside of fair use—and it's not for lack of looking.
Originally Posted by Mistook
Consider this example:
Hello darkness, my old friend,This does not create a copyright problem. The rights agency lost this one, and is bound by that result.
I've come to speak with you again.