Alto Trombone

The alto trombone is pitched in E-flat or F,
a perfect fourth or fifth higher than the tenor
trombone and was commonly used from the
16th to the 18th centuries as the highest voice
in the brass choir.
The alto trombone is primarily used in choral,
orchestral and operatic settings, although it has
also enjoyed a history as a solo instrument,
primarily in 18th century Vienna.