Last Sunday I sang at Club Passim with Syncopation. It was an a cappella show, and the whole concert seemed magical, warm and intimate. Was it the spirits of the great folk musicians who played at this venue over the years? Was it the hospitable and talented staff? Was it the good vibes of the audience that day? Who knows. Suffice it to say that we will definitely be back singing at this venerable Harvard Square institution again SOON.