Revolution 9 imo.
No, but seriously, Taxman would be perfect. The End for the drum solo. Day Tripper, Drive My Car, She Said, She Said, Etc. But really when it comes to the Beatles, you can only go so far with just the guitar/bass/drum ensemble. No sitar and such. No Norwegian Wood, no Love You To, Tomorrow Never Knows, etc. Some of their best, most iconic songs. For that reason, I think they have to go beyond the core RB/GH concept somewhat to really encompass the band's career. As Linkified mentions. Hopefully RB/GH fans are up to that.