All those endless nights onstage in Hamburg before they hit the big time must have paid off - although Ringo wasn't with them back them, he played there with with Rory and the Hurricanes (?) I believe . They really earned their chops.
That Live at the Star Club album was a goldmine - not only as a Beatles fan but because like them, we often played long shifts in dance halls, and I had to come up with new stuff to play, so I learned a lot of those songs that they used to play in Germany but which never recorded onto their albums.
Where else would I have heard Lend Me Your Comb or Red Sails in the Sunset...