Ron Price, founder of Healing Harps (Illinois) brought to my attention the occasional need for music that could be played with one hand. The beautiful thing about harp, is that this music is equally suited to either left or right hand, as one's need prescribes.
All of these, with a little adaptation (for overlapping notes) can be played hands together or split between two hands, which is how Ron used these at times for those recovering from traumatic brain injury.
The skill levels required are varied.
Notated in treble clef.
All the Pretty Little Horses, American lullaby (similar to this version for two hands)
Kuffner, Sonatina Op. 80
Pavane Espagne, anonymous (similar to this version for two hands)
Maid in the Moon (All in a Garden Green), Irish
Rakes of Mallow, Irish