Riffstation --
https://play.riffstation.com -- is quite fun and OK for giving you a basic clue as to what's going on. However, it tries to interpret what it "hears" using basic major and minor chords only and that just isn't good enough. Try
Chattanooga Choo Choo and it goes mad trying to interpret the diminished sevenths in the intro.
The only way to figure out what Bruce played is to listen to him carefully and, where you have the opportunity, watch his fingering. I'm amazed at the number of keen Shadows guitarists who can reproduce all the Hankisms, including the unintentional ones, but will play not-quite-the-right chords in
Foot Tapper!
Our forum here on
Chords, Tab, Sheet Music and Lyrics is an opportunity for us all to share what we know, or think we know. I encourage anyone who knows stuff to add to it and also to point out any errors you may find there.
http://shadowmusic.bdme.co.uk/viewforum.php?f=26