Dream Theater guitarist John Petrucci wrote the lyric to "Under A Glass Moon," which runs 7:03 - not an unusual length for the band. The song is rich in imagery; we hear about "liquid shadows" and "silver teardrops." The storyline is open to interpretation.
Speaking with Songfacts in a 2020 interview, Petrucci said
: "That song I wrote while I was listening to the song, trying to think of lyrical content. I went out in my car, sat in my car at night during a rainstorm, and I just got all this imagery. There was a full moon out, it was raining. I just came up with the title and started writing from there."