Which type of piece is most suitable for tuning an instrumental ensemble?

A chorale is the most suitable type of piece for tuning an instrumental ensemble because it often consists of melodies that are simple and harmonically rich, making it easy for musicians to adjust their pitch to a common tuning. Chorales typically include well-defined chords and a clear melodic line, which allows players to hear and match the pitches effectively. This style facilitates a unified sound and helps ensure that all instruments are in tune with one another.

In contrast, a sonata is usually more complex and may include varying tempos and key changes, which can complicate the tuning process. A suite is a collection of different dances or movements, each having their own character, which might not provide the harmonic consistency needed for tuning. A concerto often features a solo instrument with orchestral accompaniment and tends to focus on showcasing individual musicians rather than providing a cohesive sound for tuning purposes. Thus, the chorale stands out as the best choice for this specific context.