YONA is an Auxuman (Auxiliary Human) that writes lyrics and melodies and performs them. While at this time, overall the songs are not that good, they have come a long way. These type of algorithms have a way of progressing very rapidly over a short period of time.
I assume at some point, when the music becomes better from these type of A.I. they will integrate it with hologram technology and bring it out on tour. They already have holographic concerts taking place, such as this one in Japan.