FWIW, there's no real need for imagination here. The comment says "mostly", and added a parenthetical comment that was simply meant to name the viola as a prominent remaining use.
In particular, trombones have almost entirely stopped using the tenor clef in jazz.
It's true that jazz charts are unlikely to use tenor clef. Nonetheless, it remains career limiting for a trombonist to be unable to read clefs.
Commercial players are likely to use the skill for transposing Bb treble lead sheets, or playing in a pit. Tenor clef shows up in modern musicals regularly.
Not to mention being shunned from quartet or choir opportunities that are the basis of networking in the industry.
Comments
FWIW, there's no real need for imagination here. The comment says "mostly", and added a parenthetical comment that was simply meant to name the viola as a prominent remaining use.
In particular, trombones have almost entirely stopped using the tenor clef in jazz.
It's true that jazz charts are unlikely to use tenor clef. Nonetheless, it remains career limiting for a trombonist to be unable to read clefs.
Commercial players are likely to use the skill for transposing Bb treble lead sheets, or playing in a pit. Tenor clef shows up in modern musicals regularly.
Not to mention being shunned from quartet or choir opportunities that are the basis of networking in the industry.