Is there anybody out there? Pink Floyd's The Wall is a masterpiece, fusing a complex narrative with brilliantly written music, and possibly its greatest moment is Comfortably Numb. It shows the main character trapped within his own head, and juxtaposes the doctor trying to pull him back against his own internal monologue, but how? Musically speaking, what's the trick? Well, with some very clever uses of relatively simple musical ideas, the song manages to create two wildly different harmonic worlds to carry the two halves of the song's story. Plus, we take a look at what is considered by many to be one of the greatest guitar solos ever, and break down a bit of the structure underneath that, too!