Gregorian Chant arranged for small Celtic harp
For reference, here is Roráte Cæli in Gregorian neume notation. This is from the Graduale Romanum, (Solesmes) 1961, p.21 and the Liber Usualis (Solesmes), 1961, p. 353 and made freely available online at GregoBase: A Database of Gregorian Scores. Transcription by Andrew Hinkley.
Here is an instrumental version of this a cappella vocal music arranged for small lap harp. The melody of the chant has a few extra melismas and ornaments added to it. This could be played on either an Irish wire-strung harp or any Celtic harp with nylon or gut strings. A wide range is not needed; it’s playable on 16 strings!
Download a pdf of the score here.