You can reference a song title & artist, no problem. Neither are protected by copyright statutes, and all manner of examples exist of such references. Just last night I was reading a mystery novel that mentioned the Rolling Stones and two or three of their famous hits, by title. But lyrics are, of course, an entire other animal.
As for general copyright issues in the U.S., everything published prior to 1923 is in public domain. You do have to be careful to make sure that a particular later edition of something originally published before 1923 is not copyright-protected.
As for the Eliot thing, in the U.S., "The Hollow Men" was published prior to 1923, but "The Waste Land" was published after; therefore the first is in public domain, the second is not.
Canadian, Australian and EU regulations differ, and are based on the date of death of the author, rather than on individual publication dates.
As yet one more complication: for the past 20 years, U.S. copyright term has been static, governed by the Sonny Bono Copyright Extension Act of 1998, which froze that 1923 date in place. That Act runs out at the end of this year, and if no new legislation is brought to bear, stuff published in the year 1923 will lapse into public domain, and the date of copyright protection will advance a year, to 1924. I haven't seen anything about any new legislation in this regard.
caw