Baby's in Black is a waltz. But we don't hear that particular Beatles song anymore.
Hit this situation for the first time last night. The band was country and rock and played a fairly good mix. I did fine with the Country Two-Step (though it was way too crowded to do much but the basic, or progress) and also with the Ten-Step (for which they kept playing faster and faster, but we were one of the couples that was able to keep up -- not bad for a relative beginner). For the others, I've found that we can dance swing to a number of different songs.
But I found myself for the first time with a partner who just could not follow ECS. Plus, it was so crowded and I was busy trying to protect her from everyone around us, including a group that was doing some kind of line dance. I ended up needing to resort to a basic slow-dance step (which I'm still shy about), which she did well at, but I was still at a loss how to lead her so she could follow. She felt and could move to the music, so it was apparently that she was unused to lead-and-follow (for one thing, her left hand was all the way around on my back).
Lesson learned: I need to get out more to different venues and work out different dance techniques to handle such situations. Primarily, I need to figure out how to free-style.
And to stop dancing mainly with the women I already know.
BTW, I guess I didn't do too bad. I felt like I wasn't giving her a very good dance -- not able to do much except the side-side steps, slow rotation, and moving into more open floor space -- but she asked me my name after the first dance and when the next song started before we could work our way back out of the crowd, she turned around and suggested we dance that one too.