If the walls at Nectar’s could talk, or sing for that matter, they would share an intricate story of rock and roll, blues, folk, hip-hop, reggae and pop, but more than that, the story of the soulful music community on the Vineyard. Now, as the only remaining music club on the Island prepares to open for its third season, one thing remains true about the venue: No matter who’s in charge, the music continues to challenge a Vineyard audience.