The correct answer is "Few in the band have learned all of their music yet". When a verb agrees with its pronoun subject, it needs to sound natural. "Neither" and "either" always agree with a verb in singular form, and "anybody" agrees with a verb in the singular form as well.
describing how it felt to be in hiding =Diary
explaining what happened after the war=memoir
learning how people in the annex felt about Miep =diary
understanding what people did to save Anne and her family after they'd been arrested. =memoir
i tried my best i'm pretty sure it is right