For works that present a particular challenge for certain sections ( e.g. , a complex , exposed passage for the viola section ) , orchestras may have section rehearsals or sectionals in which a section of the orchestra ( e.g. , the woodwind players or the double basses ) rehearse on their own under the direction of the Principal player in the section , or , in some cases , also with the conductor ( e.g. , in the case of a very rhythmically-challenging piece ) .
Orchestras often have section rehearsals or sectionals .