A very mysterious-sounding reel I learned from Altan, composed by Mairéad Ni Mhaonaigh.
isn’t this a kind of riff?
Note the unusual, limited melodic range: up to a 5th above the A + the low G only. That makes it suitable to play in E, e’ and b also.
If you repeat the first 4 bars of the 2nd part twice, instead of rising to g as given here, the tune stays within the interval of a 6th.
This narrow compass is commonplace in Brittany and many other parts of the continent but is rare indeed in Ireland, except in children songs.
Here’s another narrow compass tune, also covered by Altan, incidentally:
Domhnall Dubh (strathspey) https://thesession.org/tunes/2679