The purpose of this study was to explore ‘Mi lagnerò tacendo’ by Gioachiano Rossini (1972-1868). Four adopted survey data ‘Arietta all’antica’, ‘Sorzico’, ‘Musique anodine: IV’ and ‘La grande coquet’ were collected from the published manuscript “Gioacchino Rossini: Mi lagnerò tacendo” by Li-Chiu, Lan in 2012. The author firstly focused on Rossini’s art song and career after 1892 since Rossini has his opera composition terminated. The life and works of Rossini’s career in this study contains how he sustained the style from the opera to the art song which including the description of the voice line, piano accompaniment, harmony, unique rhythm and the usage of the poet. Following by the composer and works, the author introduced the life and works of the poet Pietro Metastasio (1698-1782) and how Rossini conveyed the poem within melodies.

In order to pursue a deeper understanding, the author dedicated onto the study of genre and style of the four songs by analyzing the rhythmic and melodic trends. A wide variety phase of Rossini's work had lighted up the structure which leads to a brighter characteristic and a better realizing of Rossini’s late-lifetime creation.