Vivaldi taught Venetian orphan girls did they help write his music in return?

What makes the Pieta so famous... is that all of the instruments are being played by females without any males in the ensemble at all.

I discover that Vivaldi spent almost his entire career working at the Pieta and composed most of his pieces while there. But of the hundreds of girls and women who studied there, one name keeps rising to the surface: Anna Maria della Pieta.

Read at www.theguardian.com