There isn’t much (to my knowledge) piano solo music from Arvo Part. (I would be very interested in learning of more pieces – Arvo Part is my favourite contemporary composer). Here is what I know of:
4 Easy Dances for Piano: Music for Children's Theatre (1956-57)
Partita, op.2 (1958)
Sonatine, op.1 no.1 and no.2 (1958 and 1959)
Diagrams, op.11 (1964)
I cannot say that I care to much for these pieces, which are previous to his “tintinabullum” style – which he embraced after 1976. This leaves us only with three pieces:
Für Alina (Aliinale) (1976)
Variationen zur Gesundung von Arinushka(1977)
Hymn To A Great City (1984/1999) for two pianos.
“Fur Alina” is an amazing piece that requires a particular frame of mind both for playing and listening. Technically is about grade 1. To give a proper rendition of it is amazingly difficult. The best recording of it I came across is here:
https://www.amazon.com/exec/obidos/tg/detail/-/B000024HL1/102-7876887-3159303?v=glanceThere is a good description of it here:
https://www.musicolog.com/part_reviews.aspIf you want something involving the piano, there are two wonderful pieces for violin and piano: Spiegel im Spiegel (Mirror in mirror) and Fratres, if you can find a violinist to accompany.
Best wishes,
Bernhard.