You may notice that in the youTube videos below, different performers do this number in different ways, some with slightly different tunes, particularly for the instrumental part sometimes called the "turn".
If you have an AD or a DG accordion, Greg Brown's youTube videos (2nd & 3rd below) are a good place to start.
It may be easier to pick a performance/version that you like, in a key matched to your accordion, and stick with it. If you are accompanying guitar friends, they may already have a preferred version.
Greg runs though two parts quite slowly, and then plays them more quickly.
A great next step after doing the previous video. Here Greg first runs through two parts quite quickly, and then repeats the parts slowly.
Great video, music & scenery.
Great playing by one of NL's finest.
and the late Jack Hynes.
Members: Melanie Penton, Heather Penton, Jamie Hancock, Chris King & Aaron Brown.
At Joe Batt's Arm seaside folk festival, 2011.
"Mussels in the Corner" is often played at dances, as a reel, and often without vocals. However, lyrics help the process of learning a tune, even if they are not PC. See the background link for some common verses matched to this tune.