I'm stuck on the last few questions. Think this site, and the people on it are great!
29A) Musical note lowered one semitone below natural pitch indicated by the symbol D? _ L _ T?
33A) SI unit of electrical capacitance, equal to that of a capacitor in which one coulomb of charge causes a potential difference of one vault? _ A _ _ D?
36A) Small songbird with black plumage and a reddish-brown breast? _ T _ N _ C _ A _?
23D) Diagonal rib of a Gothic vault, sometimes called a lancet arch? _ G I _ E?