Indeed, and I'm pleased it looks like that was what it was. I actually thought the tumor was discovered during Final Frontier so I had hoped TBOS would be better, but it was actually worse. Perhaps it was discovered just after Final Frontier but before TBOS so the treatment was still affecting his voice. I get that, but I wish they'd postponed the album until his voice was fully recovered. As it happens, I'm not that fussed on TBOS anyway, but I really like a lot of the songs of Final Frontier, yet I rarely listen to the album because of Bruce's voice. Most of all, I'm really happy that with Senjutsu he's right back on form. Absolutely fantastic album.