Is Bix Beiderbecke Public Domain?

I'm not too familiar with copyright and public domain, a lot of the info on it I've found seems to contradict itself for some reason. Are all digital recordings public domain? If not, are his records? If I were to take one of his records, let's say I took Sorry/Since My Best Gal Turned Me Down, the Parlophone Records version, and made a digital recording of Since My Best Gal Turned Me Down, and cleaned it up myself. Then I proceeded to use in some type of media I would make profit from, would I have legal trouble? Would I only have legal trouble if I used digital recordings made by other people than myself? Would I have no trouble at all? I don't know.

I don't have plans to do anything, really, I'm just wondering.

 

The last I heard about copyright law was about 20 years ago as a music major. After an artist or composer has been dead for 50 years their work becomes public domain. The thing that makes it funny for me is that makes Charlie Parkers works public domain but Stravinsky isn't.

C/S,
Rev J

 

Looks like these are all public domain

https://archive.org/details/Bix-Beiderbecke-01-10

 

I hear from some places that it's 50, some that it's 75, so on. But either way, it's probably all pd, as Bix Beiderbecke has been dead since the early 1930's.