It’s a question all performers face at one time or another: would it be worse to have sudden, indescribable fame, only to eventually lose it all, or simply struggle, day in and day out, to achieve a level of notoriety that really never comes? In other words, would you rather be a forgotten former superstar or a half-known never was? Since all celebrity is fleeting, it’s a given that, with rare exception, the former is the typical path. But what about the latter? What about the decent, hardworking journey-man or woman who trots through the avenues of their various mediums of expression, only to locate limited returns and constant rejection. Llewyn Davis (a terrific Oscar Isaac) easily fits into this confused category. At one time in his career, he was on the brink. A previous partnership produced a modest hit. Now, drowning in a circuit that seems poised to pounce on the “next big thing,” our hero is obviously not “it.” After meeting him, it’s not hard to see why.