In Vivaldi's Concerto in E minor for Bassoon, RV 484, you can hear the violins introduce the theme, and then the bassoon enters to play solo. In every video I watch the procedure is the same: first violins and the orchestra, then the bassoon.
Looking at the sheet music, I see that the bassoon actually plays through the whole piece, mainly by pedal bass notes. Why do most renditions of the piece choose to not play them as notated?