Welp (i think this came up before), the hinge might be how "talent" is defined... could be:
-Ability to execute very complex and difficult stuff on an instrument, (making Yngwie, Dream Theater, EVH, Rush and a few others mentioned ineligible as targets for this thread).
-Ability to transport or emotionally impact an audience, (this gets a lot of otherwise pretty mediocre artists who were named off the hook ...R&R hall of fame (hack ... gag) provides many examples).
-Someone who has advanced an art form or expanded the vocabulary of an instrument, (probably puts Miles Davis, Beatles and EVH off limits).