Jon, ever since you asked about this tune I’ve had it on the brain. I stirred myself finally to fit that new stylus onto the trusty old turntable and dug out the LP “The Pipering of Willie Clancy”, Vol. 1". Here’s what Séamus Ennis’ says about the tune in the sleeve notes:
The Rolling Wave. It seems that Willie called this a slip jig (9/8 time) as a compromise, because its time-signature changes from 6/8 to 9/8 and to 3/8 unpredictably and it has me baffled too. One thing I am sure of, though: this is exactly how his father played it, for Willie was a purist in the sense that he held the old people’s tunes sacrosanct, especially those of his father.
Whatever the time-signature, Willie Clancy makes a lovely job of the tune! He definitely starts it with the low part, BTW.
But Ennis’ remarks got me wondering. So, to JC’s ABC tune finder:
JC’s search engine turned up several matches for this tune and the other one (the one recorded by Kevin Burke on “Portland”), but all the instances of this one were Henrik Norbek’s transcription (hn-jig-247) reproduced below. At first sight there seem to be no problems with HN’s fitting the tune into a straight 6/8 structure - no extra beats or anything.
But… there’s something funny about the accents. Especially the first bars of the first and second part, which definitely sound slip-jiggy to my ear. So I have played around with the time-signatures mentioned by Ennis and come up with this version. What does anyone think - have I got it right?
I know this all very academic and possibly irrelevant - learn the tune by ear and these problems might never occur to you. But if you learned it from the 6/8 version without every having heard it, would it sound right? And Ennis knew what he was talking about!
I haven’t used the abc/abc tag pair because concertina.net was bugging out on something in my abc code, so here’s a GIF instead:

X:1
T:Rolling Wave, The (slip jig?)
M:9/8
L:1/8
R:jig
Z:“Brother Steve” Jones
N:An attempt to reproduce the accents correctly with mixed time-signatures
K:D
FEF DED D2d |M:3/8 L:1/8 cAG |M:9/8 F3 DED A2 F |M:3/8 L:1/8 GFE |!
M:9/8 F3 DED D2d |M:3/8 L:1/8 cAG | M:6/8 FAF GBG|[1 A2 F GFE 
[2 M:9/8 A2 F GFE D2d || !
: cAd cAd cAG|M:6/8 F2d cAG| M:9/8 FAF GFE D2d |
cAd fed cAG|M:6/8 FAF GBG|[1 M:9/8 A2 F GFE D2 d:|[2 M:6/8 A2 F GFE ||
This is Henrik Norbek’s transcription (minus his 2nd part variations):
X:247
T:Humours of Trim, The
T:Rolling Wave, The
R:jig
Z:id:hn-jig-247
M:6/8
K:D
FEF DED|D2d cAG|~F3 DED|A2F GFE|
~F3 DED|D2d cAG|FAF GBG|AFA GFE:|
D2d cAd|cAd cAG|F2d cAG|FAF GFE|
D2d cAd|fed cAG|FAF GBG|AFA GFE :||
[ This Message was edited by: StevieJ on 2002-03-21 12:11 ]
[ This Message was edited by: StevieJ on 2002-03-21 12:12 ]