A fellow musician and I are trying to iron out problems with syncing these two songs regarding playing in unison on accordion and fiddle. I know Back Door has that very syncopated portion when going to the D chord, and around the ending. We kinda have that timing down. And another part where I hammer on the 7/10 four times in a row, where he hears two hammers and two notes walking down the scale.

What about Lacassine? Anyone know of any issues. We seem to be good on everything else.

And I have a tendency to play syncopated, in general.

The "problem" identified here is more a function of the players more than the songs they play. Both these songs are on the easy list.