CPLZ, your question about college graduate famous singers diverts the question as to whether there are any other careers, other than pro sports, for which a commitment to the service Academies can be "modified".
Of course, that also begs the question as to whether a modified commitment can be called a commitment.
Performance artists who attend college are generally in the realm of chorales or opera; you, then, might argue that they're not 'famous enough'. Immaterial. The original question remains unanswered.