The Celtics, the basketball team from Massachusetts, is pronounced sel-tiks. Oh, well, the English language, and its variants, has never been rightly accused of excessive consistency.But when people ask you what kind of music you play, you've got to have a quick and easy answer for them so you don't get bogged down in detail each and every time. For those who adhere to the Scots/Irish tradition, Celtic seems like a fine answer. People sort of know what it means.