Coverage for oxygen and oxygen equipment is dependent upon the presence of conditions that cause chronic hypoxemia. When the underlying condition is in the chronic stable state, blood oxygen testing may be performed by a qualified provider of laboratory services to evaluate the degree of hypoxemia.
A work in progress-new features will be added periodically. The trombone glissando is an idiomatic and frequently used technique that is often misunderstood. Too often composers write glisses that don't work on the instrument, thinking that any are possible. This information sheet outlines the rules for writing glisses that will work on the trombone. It can also be used as a slide position chart which shows the partials of the harmonic series. *Now updated to include glisses for the F-attachment, the bass trombone, and the alto trombone.
Tinctoris, circa 1487. The sackbut differs from today's trombone by its smaller bore, its bell which is less flared, and in the lack of a water key, slide lock, and tuning slide on the bell curve. Sackbuts could adjust tuning at the joint between the bell and slide.