Your ability to mimic sound you've heard has greatly improved, As a reaction, if a spell is cast within 30ft of you can memorize the spell. The spell must be one with verbal components, the spells must be of a level for which you have spell slots and of a level less than your proficiency modifier.

A memorized spell counts as known and prepared until the end of your next long rest. You can only have 1 spell memorized at a time. If you have a spell memorized and want to memorize another, you forget the first.