I found MTMR and am really liking it so far. However I also enjoy listening to music with Pianobar but saw there was no love to make the current song playing show in the touchbar. The following is what I did to make it work. Mac OSX 10.14.5 is what I am using, but this can also be made to work on any *nix distro as well.
My repo of files are located here
You have to change the config for pianobar to find pianobar-notify.rb. You can do this by adding the following in ~/.config/pianobar/config:
event_command = /full/path/to/pianobar-notify.rb
Take note that in the MTMR config (items.json) the weather api is redacted, get your own! Also inside pianobar_notify.rb you need to change the full path to where the file goes.
Other than that, it works for me! Horray!