Artists performing concerts in similiar style to Ayu?

[Key ~eternal tie~]

For me, I really enjoyed Tohoshinki's Secret Code Dome Tour. It starts off slow but then the dances, big stage was really cool and they have amazing voices. I don't think they've been off key once.
Gackt's Tokyo Dome tour was also quite good with real horses on stage, swords and Gackt hanging/flying above the crowds. Vocally, it wasn't his best though. His Sixth Day Seventh Night was better.