Keep 20 different backups of the song. It’s both worrying and scary that this sort of thing can happen. Now I’m paranoid - what if more songs have changed and I haven’t even realised it. I just spent the last few hours listening to a lot of songs I haven’t heard in ages to check if they are as I remember them. Also, I do wonder if Sarah felt a bit intimidated by Florrie’s presence on the song. Surely, Florrie is a bigger deal than Sarah (in her own little universe).