To help him think, as well as to generally keep himself amused (and others bemused), the Second Doctor enjoyed playing his recorder. Jamie, presumably fed up with it, once made him leave it in the TARDIS (The Enemy of the World) and the Doctor was forced to mime his piping instead. But much like the Sonic Screwdriver, the Doctor cant help tinkering - his recorder also doubled as a spyglass in The Wheel in Space and The Invasion. Tackling the Cybermen again in The Moonbase, he even used it to disrupt their sonic control over people. It was also integral to his defeat of Omega in The Three Doctors. So just bear that in mind the next time youre in music class and someone hands you a recorder. It could just save the universe one day. Well, this is assuming that you get sent to a universe of anti-matter with two of your other selves to face an ancient stellar engineer gone mad with power. Normal weekend for some.