Oh, I've been know to show up with a song sheet for some new song I'm in love with but I really make an effort to practice the song as well.

And there is a good case that can be made for raising a song with a well-known chorus, just not the same one week after week.

The other extreme is presenting a new song with a complicated chorus and expecting people to pick it up immediately. No, slow down and repeat the chorus as many times as is needed so people can sink their teeth into it. And if they like it then, bring it back at least once more.

Cheerily,
Charley Noble