YouTube has become an increasingly common platform for launching young musicians' careers. Its reputation, though, has been pretty negative since to date the most notable musical product of YouTube has been Justin Bieber. The largest demographic of YouTube users is probably teenagers, so that's not terribly surprising. On the other hand, there is nothing to stop a more interesting musician from attaining notability via internet videos.
For some time now I've been following a young power metal vocalist, PelleK, on YouTube. Recently he has launched a new channel and started recording studio vlogs of his work on a new album. His style is more flowery than what I typically listen to, but it still illustrates a valid point: it is possible for far more talented and diverse musicians than the typical teen pop fodder to launch their careers via YouTube.