I heard a version sung by Triona ni Dhmomnaill (from the Bothy Band) that was very up-tempo -- almost suitable for a hoedown. Slightly different lyric structure:

There were two sisters side by side
Sing ai-dum, sing ai-day
There were two sisters side by side
The boys are bound for me
There were two sisters side by side
The eldest to young Johnny cried
I'll be true unto my love
If he'll be true to me.

Unfortunately, I heard this sung live, and have never heard this version done by anyone else.