It's a musical genre which has mixed with emo, screamo, post-hardcore and metalcore. It was invented by Alesana fan. It is used as a true identity from Alesana being a screamo band. It is used with "Fa", "Mi", Sol" and "Si" musical notes with metalcore screaming and high pitched singing by both male and female vocalists.
Alesana are not emo, nor screamo. But they sound so Autumncore. I have listened Their "The Emptiness" album and it sounded so autumncore. I liked it. The members of this band are wrong for labeling "emo" or "screamo". It did NOT make sense.