It’s not been easy to get to see the rous­ing Amer­i­cana band Seafoam Green play live, but Dave O’Grady and Muire­ann McDer­mott Long made two appear­ances in Lon­don last week­end. They head­lined a packed out Lex­ing­ton (good to see the place so full on a Mon­day night) and they real­ly rocked.  The line­up also included…