The leather bag below the pipes must stay full of air, and achieving a robust sound takes strength.

There is no longer a religious connotation, people just like the robust sound.

The result is clear, robust sound that fills a large space.

Yet when a robust sound was needed, its sound was big and vibrant.

The chorus also shines, making up in robust sound and intensity for what it lacks in sheer numbers.

His voice boasts a robust sound, though his lower range was gravelly.

Still, he brought his customary dynamic presence and robust sound to a role he clearly relishes.

But for now, he sings Mario with robust sound and ardency.

With so many voices, they can produce plenty of warm and robust sound without ever forcing.

His voice lacks the warm, robust sound of a classic Verdi baritone, but he gives an interesting performance.