martines and her sister, neither of whom ever married, looked after their family friend metastasio until his death in 1782. upon his passing, metastasio left his estate to the martines family; marianna received 20,000 florins, metastasio's harpsichord, and his music library. marianna and her sister hosted musical soirees at their home. these weekly musical events attracted many distinguished guests, including haydn and irish tenor michael kelly. mozart also was a frequent guest to the soirees and composed four-hand piano sonatas to perform with marianne.