Is the violin a transposing instrument.
The clarinet is a Bb instrument.Alto and Baritone Saxophone are instruments.The Soprano Saxophone is a Bb instrument.An F instrument is the English Horn.The individual instruments can either be in B flat or C.
Is it a transposing instrument?A transposing instrument is one that has a different key signature than the other instruments.The timpani is an exception to the rule.The meaning of "Timpani in D" is that the drum head is in tune with the pitch.
To make it easy to switch between instruments in the same family, the parts for the instruments are changed so that they produce different pitches.