I've started a second tango blog called Tango, Vals & Milonga. I will share Spotify playlists and recommendations to albums and music available online. For an example here is a Spotify playlist of Anibal Troilo instrumental tangos from 1938-1945. The playlist is in chronologial order based on the listings of www.tango.info of Troilo's recordings. Some of the tracks are in questionable quality but they were the best I found.
Be sure to follow the new tangoblog Tango, Vals & Milonga for more updates and playlists. Happy new year!