Record yourself and tell me how you sound. It's really weird how you think you sound one way then when you listen to it, it's not at all the way you thought.
Obviously everything up to Awake is hard as shit. Unless you have a phenomenal voice...you aren't hitting a lot of those notes.
But I do think that after the food poisoning he become much easier to sing along to. Something I found out recently is that I have a much deeper voice than Labrie, even post food poisoning. For the longest time I would sing in my car to Dream Theater thinking I was hitting the notes (I know, cringey as shit...sue me), and I was, but it was an octave lower and I didn't even know it. I recorded my voice singing a few DT songs and some parts sound horrible, but the parts that sound good are actually an octave lower. I'm not the greatest singer in the world, but I'm not the worst. It's just kind of crazy how I thought I was hitting the notes perfectly on point and I listen back to it and it doesn't sound bad...it just sounds lower
Even Iron Maiden...I cannot hit those notes. I recorded myself singing along to Revelations and the only part that sounded sexy was "The Light of the Blind". Everything else was...either terrible or good, but lower.
My voice has no harmony to it. It only sounds good when I get gritty with my voice. Me trying to sing harmony is like watcing a cringe compilation on youtube. To be fair though, I've recorded myself singing along to thrash metal, and it's pretty dope.