Written separately and with different origins and purposes, they were nevertheless published together, in 1898, and are often performed as a cycle in this sequence:
Ave Maria (unaccompanied chorus, in Latin, composed 1889)
Stabat Mater (orchestra and chorus, in Latin, composed 1896-1897)
Laudi alla Vergine Maria (unaccompanied female voices, in Italian, composed 1886-1888)
Te Deum (orchestra and double chorus, in Latin, composed 1895-1896)
The "Ave Maria (sulla scala enigmatica)" uses the enigmatic scale.