When I was a collegian - all of the chapters had to sing the same "Go Greek" song first round for entrance and exit.
The chapter I advise at - no one at our campus sings or chants first round, but then they do a different entrance and exit song for each day, plus songs for skit and prefs, so that comes out to be 8 or 9 songs. (in/out philanthropy, in/out skit + 1-2 group songs, in/out pref + group ceremony song.) Some chapters have instrumental music instead of a song for the pref entrance. It can be a lot to learn.
I rushed 20 years ago, and I can remember many, many of the chants - even from houses I visited just one or twice.
I feel like I will be the same. I know many of them too. Especially the house near, those poor girls have to practice at 8am during their spring workshops.