music recommendations

If you like RVW, you might also like Gerald Finzi.

I love Vaughan Williams as well as traditional classical music. I would suggest you try Sibelius and Delius if you haven't yet.

If you like Vaughan Williams, you might also explore

Malcolm Arnold (e.g., Beckus the Dandipratt, Eight English Dances, Four Scottish Dances, Symphony No. 2)

Frank Bridge (e.g., Cherry Ripe, Sally in our Alley, Sir Roger de Coverley, Suite for String Orchestra)

George Butterworth (e.g., A Shropshire Lad, The Banks of Green Willow)

Hubert Parry (e.g., Lady Radnor's Suite)
.

Depending on what it is about Arvo Part's music you like, you might like:

Andrzej Panufnik (e.g., Sinfonia Mistica, Sinfonia Sacra, Landscape)

Eduard Tubin (e.g., Symphony No. 4, Estonian Dance Suite)
.

Alan Hovhaness. You might also like early music: a capella vocals performed by The Tallis Scholars, The Clerks' Group, the Paul van Nevel ensemble, Cantus Colln, The Sixteen, and others.