I think Chris Norman’s rendition of the Fairy Queen is one of the most beautiful things I’ve ever heard
There is no doubt that some of the older tunes were played at slower tempos, but there is a huge difference in affect and content between the playing of say Matt Malloy playing a slow air and James Galway playing the same thing.
Most of the stuff I’ve heard Chris Norman do has been very “tastefully spirited” and here again, Chris is first and foremost a traditional player doing classical rather than the other way around. The Baltimore Consort has done some nice albums of Irish and Scots early music; my only complaint is the absence of the Gaelic harp and Warpipes, the two most important instruments of Gaelic society at the time.
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I have a couple of other versions, one by Andrew King and the Harp Consort, I think the other’s by Patrick Ball, and both played like funeral dirges.
Andrew Lawrence King is a grand musician and a great interrupter of Renaissance and Baroque music on old style European harps, but his playing of the wire strung Gaelic harp seems somewhat strained. He tried to work from printed sources from Carolan’s time and just after; the trouble with this is those printed sources were arrangements for keyboard instruments (harpsichord or piano) and features things impossible or impractical on the old harps without massive reworking.
Patrick Ball’s playing, while a bit flowery is much close to a “traditional” in approach as we’d understand it and much more convincing as a result.
However, If you really want to have a glimpse of what Gaelic harping sounded like in the old days, find the recordings of Ann Heymann, especially " Queen of Harps" or “Heman Dubh”. Fairy Queen isn’t on either of these recordings, but other O’ Carolan tunes are. Her playing is simply amazing and these old tunes leap to life in her hands.
BTW, there was another composer, possibly a couple of decades younger than Carolan, (Giaccomo Baldini?) who also somewhat bridged the gap between chamber music and folk music
There were many such composers in Scotland and Ireland at the time and just after, some native born, others from Europe. Handel premiered “Messiah” in Dublin to wild praise, Geminiani worked in both England and Ireland for a time. For a time Scottish and Irish tunes were popular in Europe, reset by the likes of Haydn and Beethoven.
Bear in mind that the hard lines between popular and high art music were rather more blurry in those days than now. What was an Opera aria one week was reset as a dissent hymn to vino the next! Or vise versa. The tune to “The Star Spangled Banner” was originally used in a drinking song!