The Saxhorns group is the example of confusing writing previously discussed
This group has historically been subjected to addition and subtraction of instruments but the most common range includes
Flugelhorn Eb (or sopranino)
Flugelhorn Bb ( soprano or contralto )
Alto Saxhorn Eb ( or Ténor Horn)
Baritone Bb ( or Tenor Horn)
Their theoretical range is similar to the trumpet one .Actually only Flugelhorn (Bb) and Baritone have a satisfying full range when played by a concertist.
Since these instruments are dedicated to the upper parts they logically use the treble clef
However Baritone (also named tenor and therefore written with treble clef) sharing Bass register a single sound are differently written ,while Bb Bass using the same written note and clef as BBb contrabass sound differently .
1 Flugelhorn Eb -2 Flugelhorne Bb 3 Alto (tenor Eb horn) 4-Contrabass Eb 5-Contrabasse BBb
An historical ambiguïty results from the old classification; Baritone beeing considered as a Bass should had been written with bass clef