The fact that this piece has been my one and only opportunity in orchestral tuba performance (way back when) makes me both smile and cry at the same time.
Side note: if you look at the full score (or choir part), look up that "Herr, lehre doch mich..." baritone solo (Lord, make me to know mine end, and the measure of my days... as mentioned earlier).
It´s a beautiful solo worth playing on tuba for the joy of it.