What is the difference between a professional orchestra and semiprofessional orchestra?

Answer 1

Simply put, a professional orchestra is one in which the musicians make their living primarily as orchestra musicians. A semiprofessional orchestra usually has a core of professional musicians, as well as players who, while of professional (or near-professional calibre, make their living primarily outside of performing. This can include students, talented community members who make their living outside of music, and musicians who make their primary living outside of performing. Musicians in a semiprofessional orchestra are generally paid, but there are usually several pay levels dependent upon the player's status. For instance, there may be principals (section leaders), section players (full-time), section players (part-time), and section players (student). Semiprofessional orchestras also tend to engage musicians who play unusual instruments on a per-call (casual) basis.