Just to start this out with a weak beginning, let me say that alto clef is pretty much never used. To my knowledge, the only instrument that utilizes it is viola (AKA the best instrument). However, I guess some non-violists just want to learn alto clef to become a more well-rounded and knowledgeable musician. Alto clef is also really useful for writing down melodies in the lower range of female vocalists, like for verses and such, if you don't want to drown in ledger lines. It can also be used for the upper range of male vocalists. But no matter what your purpose is, learning alto clef is quite simple. Let me show you to this land of violas; I promise it won't hurt (probably).
