TMEA 2021-2022 Euphonium Etude 2 - B-flat Major 

The notation specifies if there are any alterations to the turn. This one has a natural sign underneath the turn which indicates that the lower note of the turn is natural, making the bottom note an E-natural (2nd valve) instead of E-flat, but the top note is an unchanged G. Hope this helps!

@@TylerHardee sorry to bother you again, but at 51 do you play the A natural at the beginning of the turn? or do you skip it

I use a Bowman model BB1

@@wesleyderden9561 he's my lesson teacher homie, I was just joking