Actually, you can't do that without permission. US copyright laws and their enforcement are different for song lyrics than for other intellectual property.
See the second letter and its response
on Neil Gaiman's blog for one very successful, very savvy writer's experience with this.
Not really.
It may very well be the prerogative of publishers to pay a licensing fee to content owners for any reference to a copyrighted work, and $150 is pretty cheap to avoid a fight, but that doesn't mean that seven words from a song lyric is copyright infringement.
Gaiman did, after all, reproduce the lyric on his blog; and likely did not pay the demanded $800 to do it, nor did the rightsholder pursue him. If it were infringing in the text, it would be infringing on the blog, which Gaiman uses to promote his commercially available works.
For a writer, a don't-rock-the-boat policy among publishers might as well be the law, as far as affecting decisions about how to use this stuff. But it isn't actually the law.
I took a class in art law, where we looked at the boundary between appropriation and infringement where existing works are referenced in new works.
I remember that lifting a sample from one song and putting it into another song is an appropriation that requires compensation, but quoting a song lyric isn't really the same thing. It's more a reference than a derivative work, and it likely falls outside the rightsholder's control.
You have to understand this is a political issue; content owners have a strong pecuniary interest in an expansive view of copyright, and since publishers are content owners, they have little interest in advocating a different construction of copyright.
Authors and other artists have an interest in protecting and exploiting their own copyrights, but at the same time, to the extent that other media represent a significant part of the world and culture an artist may be depicting or commenting upon, restrictions on use of or reference to mass culture tends to dampen speech and art.
Unfortunately, content aggregation is prevailing at the expense of art; all of modern culture is owned, and nothing lapses into the public domain anymore.
Content owners would demand a royalty payment for people singing in the shower if they could figure out how to collect it. Just because they say you owe them money for use of the phrase "We'll be making love" doesn't mean it's true.