I was initially unprepared to do a vocal review of this song, but when I noticed just how much I disagree with the only other review of this song (which, luckily enough, happens to be another vocals review), I could not help but react. Regarding this song, I admittedly did not know of it until I bought the entire Billy Joel pack, but after giving the song a few good listens and playthroughs, I have come to love it just as much as most of Joel's other work.
The chart launches immediately after the guitar's main riff, and already I could tell that this song will be fun. The pitches descend downwards in a "walking" fashion; what I mean by that is that the pitches are extended and seem to lazily drift down to the low end of the phrase. I react positively to this because it makes it easier to reach the bottom notes without struggling. Every third phrase of the song starts to descend, but they slyly shift up at the end in a very delayed fashion, which I again like because this time I can apply some extra techniques (like for example vibrato) without much difficulty. The phrases themselves can be simple to get down, but Joel would sometimes make sublte change to the main structure, meaning that the song constantly engages you in singing along with it.
The chorus goes for the more higher pitches in a more versatile pattern, varying from ascending to descending in quick, back-to-back phrases. There is a surprise hidden in the chorus that may catch even those familiar with the song off-guard: the high pitch "Ho~ but it just may be a lunatic..." At first playthrough I almost overshot the pitch, but thankfully if you would miss it, it would not affect much of the "pie". This pitch, on the other hand, does make several appearances in the choruses, so be on the lookout once you are playing the song.
The second verse features some patterns that differ from the first, with offbeat lyrical placings that extend through at least two of the phrases. I recommend that people should get more affiliated with the lyrics when attempting to sing this song (especially on expert). After that comes the second chorus, which seems at first the same as the one before it, but some phrases are sung way offbeat, in particular: "It's too late to fight / It's too late to change me". If not sung correctly, the vocalist will miss his/her chance at filling the "pie" to its maximum, meaning no FC. The third chorus that follows the instrument solos is, in fact, much, much more different than either of the preceding choruses. The pitches are higher than expected, and some are (again) offbeat from what you would perceive, so exercise caution once reaching this stage. Breeze through that final hurdle, though, you will find some easy outro phrases that consist of only two pitches, so you will not have any trouble getting through that if you were successful in passing the majority of the song already.
In short, this song is nowhere near as "predictable" and "generic" as the other reviewer would have you believe. It is an exciting, fun experience that should be enjoyable to vocalists of any skill level.
Also, let me get this off my chest: Billy Joel is a fantastic singer; his songwriting varied in quality in places in the 80s but this song is more than decently written because it tells a detailed story; the lyrics of the song do not depict a breakup in-progress, but rather a romance between two very different people. There, I am done ranting.