This foo_run is such a helpful component, no idea how I ever used foobar without it! 
I finally made Foobar work with external applications. The code that worked for me was [...]
Discogs artist
"https://www.discogs.com/es/search/?q=$meta(artist)&type=artist"
Discogs album
"https://www.discogs.com/es/search/?q=$meta(album)&type=release"
Hey @tipar thanks for the samples.
Just wanted to let folks know the above searches on Discogs might not work for artists / albums that have a space in the name. Copying what the other samples use works -
Discogs artist
https://www.discogs.com/es/search/?q=$replace(%artist%, ,+)&type=artist
Discogs album
https://www.discogs.com/es/search/?q=$replace(%album%, ,+)&type=master
(I changed the album to show the master entry as a better place to start to look up the dozens of releases on Discogs)
Also here is another video player I use -
Media Player Classic
mpc-hc.exe "%_path%" /new /add /play /close
mpc-hc.exe "$info(@)" /new /add /play /close
(Use the second path if you tag your videos with external m-TAGs component)
Cheers