Thanks for pointing that out. Not exactly being a huge Bee Gees fan and hence not knowing their logo I hadn’t realised that before.

Both are set in Gothic typefaces. However, while looking similar they’re not the same typeface.

I think it could be a nod to the Bee Gees or even a pastiche but I suppose I’m going with huge coincidence here. I don’t think that back when they started the band Blind Guardian put a whole lot of thought into their logo other than “It’s got to look Medieval and fantasy-like.”.

By the way, Bee Gees stands for Brothers Gibb.