What is considered Ayu's magnum opus?

[ComatoseBunnySnatcher]

Song-wise, I'd say SEASONS/M is considered her magnum opus by her fanbase, though from those two I would choose M over SEASONS because it was also composed by Ayu. Can't actually name a song for myself since there's a lot, but I would choose forgiveness, Dearest, JEWEL, Mirror, progress... One of those.

Album-wise people are choosing I am..., though I do feel Duty should take the title from the first 5 albums. I am... Suffers from very similar songs lumped together at the end. Duty is varied, has the trilogy and SURREAl, ect. Personally, I would say Memorial Address is her best album hands down. Every song is well produced and doesn't feel like filler. The next ontender would be (miss) understood. I just like its variety of sounds.