All his old stuff (2009-2013) are on DatPiff, which is a mixape streaming website/app. You can download the music too and it’s all free.
Here's the link:
You sure? Can’t find it
I manged to find it by searching: young sinatra undeniable in the windows store app.
His older songs are on SoundCloud, but I really wish they were on Spotify so they could be in my other playlists; we need to do something.