Some years ago I bought a programa Tabledit(€50) and with that program you can put music
on paper by notation or tablature for many instruments.

One of those instruments is the diatonic accordion and also the Cajun-accordion.

From the start I'm busy with putting Cajun-songs in Tabledit.
Most songs are made for a one row Cajun Accordion in the key of C !

The maker of the program also made a free program TEFview, just like Tabledit available for
Windows, Apple en Android and you can play the songs made with Tabledit.

The files have the extension .TEF and you can find them on the internet
for many of the instruments which can be edited with Tabledit.

With TEFview you only can listen or look at the files,
but you can slowdowns the music, so it's easier to play along.

Download TEFview with this link.

Here's a link to a short video, which open on a new page, how to use TEFview

You can find the files I made until now on this pagina

The files also are on the website Freetabs.org, and there is much more for other instruments en music.

I found on internet a website terecht from George Peck, who also play Cajun accordion.
He also wrote down some songs in music notation and I put some of his songs Tabledit.
De website van George Peck