I ended up scrambling trough every album page on wikipedia. I didn't check singles.
These are the tracks that has someone listed as keyboardist\whatever.
Here are the results:
Message to Harry Manback II
This is Wikipedia so it may, or may not be a trusted source.
Feel free to update this answer in ...
I find it hard to believe that a band (any genre, not just rock) can produce a song over an hour long and retain enough musical interest to satisfy anything but the most die-hard fans. Maybe there's some kind of macho competition going on (who has the longest?). Unless they're streamed, tracks are often sold at a fixed price per track, so this would also ...