Turn us on to someone that we aren't overly familiar with. A band (or artist) who are exceptionally good at what they do, but that for whatever reason has never really caught on.
Here is one band that I really, really dig, but they only have a small cult following.... (Probably because they're so damned odd and cross so many barriers that radio guys didn't know what to do with them.)
The Galactic Cowboys!
So who would you list as a GREAT, but largely uknown band??