Hikki did some covers or just sang old and epic songs like Moon River, Fly Me to the Moon, Living On My Own, Close to You and I Won't last a day without you (with Shiina Ringo, but that was under Ringo's name) by The Carpenters and Paint it Black, to an extent.

I already heard and knew some of these songs by the original artists, but of course Hikki does it better (to me at least). It's good that she shows an appreciation of the oldies and thus making her fans also appreciate it and not just listen to contemporary music. She made me like Moon River and Living On My Own, but I'll still listen to her version. I gave the original performers a listen too of course.