Have to memorize lines for a play or musical? There are a lot of techniques. Let me tell you about a few that are backed by science. I've been involved in the theatre for many years and I've done a lot of memorizing of both lines and song lyrics. Typically, actors and singers use repetition - and don't get me wrong - that works, but there are other ways to get those lines into your head. Ever heard of interleaving? How about using the Method of Loci (often called the Memory Palace) to memorize the sequence of an entire play? Impossible? Nope. Let's take a look.