You're right, sorry I was tired last night and wasn't really thinking. If you have bands like guns n' roses with Axel, where the sound of his voice really compliments the guitar or if you take Bruce Dickinson from Iron Maiden, where his voice matches the entire meaning of the lyrics perfectly it can really be the wow factor in a band.
Also, if you have someone like Maynard from Tool - who writes lyrics that add so much depth to the music that you actually have to sit there and think about it; then by all have include it.
I was thinking about your original question and I remembered where I'd heard a lot of it before. You can try search on youtube "irish tap dance", weird search I know, but when my sister used to do tap dancing way back I remember music very similar to this. Try out lord of the dance, link's below.
Edit: posted the link above from memory, just listened to it, it's not the best quality but you'll get the idea.