Well, it looks like the Kilmartin Sessions is one of the only other real things I can find: http://www.kilmartin.org/music/music.html They have a few short samples on the site and it's available on CD for about 14 pounds.
This Carolan's Receipt CD is harp music that is pretty early compared to anything else we have written down, but it's only 17th century - and it sounds a little like it too, but he was also influenced by some classical composers.Using original instruments and reconstructions, this unique CD offers, for the first time, a chance to hear the sounds that would have been familiar to our forebears thousands of years ago. It includes the first commercially available recordings of the two thousand year old Caprington horn, the 8th century iron bell of St Adomnan, the 9th century Pictish triple pipes, and many other remarkable items, including a traditional Gaelic quern song and its use as melody for St Columba's visionary poem, the Altus Prosator. The music ranges from ringing rocks to bird-bone flutes; Bronze Age horns and drums to the extraordinary sound of the Celtic war trumpet, the carnyx (left), specially recorded for the Kilmartin Sessions in Smoo Cave. It ends with the eerie combination of harmonic singing and Bronze Age horn, recorded in the Hamilton Mausoleum - the building with the longest reverberation in the world. It was an appropriate choice, for like the Mausoleum, this CD has its own reverberations reaching into our remotest past and our deepest sub-concious.
http://www.cduniverse.com/search/xx/music/pid/1097983/a/Carolan's+Receipt.htm
"Derek Bell recreates the authentic sound of Carolan, the blind 17th century Irish harper who transformed this traditional musical genre. (Actually Bell is almost certainly a far better harp player than Carolan, whose genius was composition, not performance.) Bell mainly uses a wire-strung harp, which gives his arrangements the haunting air of a music box. Listen closely for Bell's magical musical embellishments. Bell includes some of Carolan's best-known pieces (Blind Mary, George Barabazon, and Carolan's Farewell to Music) but also treats us to some lesser-known masterpieces, including Lady Athenry, Caralon's Nightcap, and Lady Gethin."
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