Caro mio ben by Tommaso Giordani (sometimes attributed to Tommaso's brother, Giuseppe) is one of the most beloved voice pieces from the classical repertoire.
It was also included by Alessandro Parisotti in his best-selling XIX century book "Antique arias", still used nowadays by most classical singing students and teachers.

The inner beauty and simplicity of this melody make it a great song for beginners, but also a tough challenge for the most experienced singers to show their musicality... just have a look at Cecila Bartoli's version of "Caro mio ben... » ... sing it!