About a year ago, I downloaded and played with an app called "Chord AI". I installed on my Android phone. I don't know what other systems it is available to run on. I tried one other that I deleted and kept this one. This does not produce full notation or tablature, but gives you chords. I gave it some of my own songs to test it and it did great (easiest 3 chord shit you can think of). The more complex or "heavily mixed" stuff was, the less accurate it's results became. But it was sufficient for my needs, put me in the ballpark and then I just play around from there (7th, min7th, sus2, sus4, etc.) to see what I think sounds best. I don't use this app much though because I can find chord charts for most the stuff I want. I've never used the feature where you can feed it url or streamed stuff on your phone, I always used mp3 or flac files to feed it. You can also use the phone mic and read from that but I also have not tried that feature, though now that I think about it, I should!